Updated WebKit from /home/joce/dev/qtwebkit/ to qtwebkit-4.6-snapshot-18092009 ( 15c07fb8d7fa5e93c939aa7eb21c06e19c754cee )

Changes in WebKit/qt since the last update:

++ b/WebKit/qt/ChangeLog
2009-09-17  Janne Koskinen  <janne.p.koskinen@digia.com>

        Reviewed by Simon Hausmann.

        Symbian build fix.

        Moved the #ifdefs around _q_cleanupLeakMessages() into the function
        definition.

        QMake is not being able to distinguish between release and debug builds
        in Symbian build. This is a Symbian toolchain issue.

        * Api/qwebpage.cpp:
        (QWebPagePrivate::_q_cleanupLeakMessages):
        * Api/qwebpage.h:
        * Api/qwebpage_p.h:

2009-09-17  Jocelyn Turcotte  <jocelyn.turcotte@nokia.com>

        Reviewed by Simon Hausmann.

        Small cosmetic documentation fixlet in the QWebInspector.

        * Api/qwebinspector.cpp:

2009-09-16  Benjamin C Meyer  <benjamin.meyer@torchmobile.com>

        Reviewed by Eric Seidel.

        Detect and add Windows7 properly to the user agent.

        * Api/qwebpage.cpp:
        (QWebPage::userAgentForUrl):

2009-09-16  Andras Becsi  <andrewbecsi@yahoo.co.uk>

        Rubberstamped by Kenneth Christiansen.

        [Qt] Build fix for previous changes.

        * QGVLauncher/main.cpp:
        (MainView::flip):

2009-09-16  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Unreviewed potential Qt < 4.6 build fix.

        * QGVLauncher/main.cpp:
        (MainView::flip):

2009-09-16  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Reviewed by Simon Hausmann.

        Add a "Flip effect" to our GraphicsView based launcher.

        * QGVLauncher/main.cpp:
        (MainView::resizeEvent):
        (MainView::flip):
        (MainWindow::flip):
        (MainWindow::buildUI):

2009-09-16  Zoltan Herczeg  <zherczeg@inf.u-szeged.hu>

        Rubber-stamped by Simon Hausmann.

        [Qt] Typo fix. Pass the window object to the Format
        menu. In this way Qt can free its internal graphical
        objects during exit.

        * QtLauncher/main.cpp:
        (MainWindow::setupUI):

2009-09-16  Jocelyn Turcotte  <jocelyn.turcotte@nokia.com>

        Reviewed by Tor Arne Vestbø.

        [Qt] Build break fix on gcc ARM.

        * Api/qwebgraphicsitem.cpp:
        (QWebGraphicsItemPrivate::_q_doLoadProgress):

2009-09-16  Warwick Allison  <warwick.allison@nokia.com>

        Reviewed by Simon Hausmann.

        Fix a crash in QWebFrame::hasFocus() with a simple null pointer check
        when the focused frame is null. We do the same check in other places
        where we call kit().

        * Api/qwebframe.cpp:
        (QWebFrame::hasFocus):

2009-09-16  Jure Repinc  <jlp@holodeck1.com>

        Reviewed by Simon Hausmann.

        Fixed a typo found during translation.

        * WebCoreSupport/FrameLoaderClientQt.cpp:
        (WebCore::FrameLoaderClientQt::interruptForPolicyChangeError):

2009-09-14  Jakub Wieczorek  <faw217@gmail.com>

        Reviewed by Simon Hausmann.

        [Qt] QWebGraphicsItem should check for null QWebPage.
        https://bugs.webkit.org/show_bug.cgi?id=29185

        Don't crash in QWebGraphicsItem when the page is still null, by
        either checking if it's the case or constructing the default one.

        * Api/qwebgraphicsitem.cpp:
        (QWebGraphicsItem::icon):
        (QWebGraphicsItem::setZoomFactor):
        (QWebGraphicsItem::zoomFactor):
        (QWebGraphicsItem::setGeometry):
        (QWebGraphicsItem::load):
        (QWebGraphicsItem::setHtml):
        (QWebGraphicsItem::toHtml):
        (QWebGraphicsItem::setContent):
        (QWebGraphicsItem::history):
        (QWebGraphicsItem::settings):

2009-09-11  David Boddie  <dboddie@trolltech.com>

        Reviewed by Simon Hausmann.

        Doc: Note that Netscape plugins are only available on desktop platforms.

        * docs/qtwebkit.qdoc:

2009-09-11  Martin Smith  <msmith@trolltech.com>

        Reviewed by Simon Hausmann.

        Adjust the name of the contentspage for the documentation
        to the new name used in Qt 4.6.

        * docs/qtwebkit.qdoc:

2009-09-11  Ariya Hidayat  <ariya.hidayat@nokia.com>

        Reviewed by Simon Hausmann.

        Changed URLs from qtsoftware.com to qt.nokia.com, as part of a general
        renaming.

        * Api/qwebpluginfactory.cpp:
        * docs/webkitsnippets/simple/main.cpp:
        (main):
        * docs/webkitsnippets/webpage/main.cpp:
        (main):

2009-09-11  Volker Hilsheimer  <volker.hilsheimer@nokia.com>

        Reviewed by Simon Hausmann.

        Restructure the documentation, both on a file and on a content level.

        * Api/qwebdatabase.cpp:
        * Api/qwebelement.cpp:
        * Api/qwebframe.cpp:
        * Api/qwebhistory.cpp:
        * Api/qwebhistoryinterface.cpp:
        * Api/qwebpage.cpp:
        * Api/qwebpluginfactory.cpp:
        * Api/qwebsecurityorigin.cpp:
        * Api/qwebsettings.cpp:
        * Api/qwebview.cpp:
        * docs/qtwebkit.qdoc:

2009-09-11  Yongjun Zhang  <yongjun.zhang@nokia.com>

        Reviewed by Simon Hausmann.

        https://bugs.webkit.org/show_bug.cgi?id=29136
        [Qt] emit microFocusChanged() signal when no QWidget-based view is present.

        emit microFocusChange() signal regardless of view.

        * WebCoreSupport/EditorClientQt.cpp:
        (WebCore::EditorClientQt::setInputMethodState):

2009-09-11  Jocelyn Turcotte  <jocelyn.turcotte@nokia.com>

        Reviewed by Simon Hausmann.

        https://bugs.webkit.org/show_bug.cgi?id=28806

        [Qt] Make the WebInspector available as a QWidget.

        * Api/headers.pri:
        * Api/qwebelement.cpp:
        (QWebElement::enclosingElement):
        * Api/qwebelement.h:
        * Api/qwebinspector.cpp: Added.
        * Api/qwebinspector.h: Added.
        * Api/qwebinspector_p.h: Added.
        * Api/qwebpage.cpp:
        (QWebPagePrivate::QWebPagePrivate):
        (QWebPagePrivate::setInspector):
        (QWebPagePrivate::getOrCreateInspector):
        (QWebPagePrivate::inspectorController):
        (QWebPage::~QWebPage):
        (QWebPage::triggerAction):
        * Api/qwebpage.h:
        * Api/qwebpage_p.h:
        * Api/qwebsettings.cpp:
        * QtLauncher/main.cpp:
        (MainWindow::MainWindow):
        * WebCoreSupport/InspectorClientQt.cpp:
        (WebCore::InspectorClientWebPage::InspectorClientWebPage):
        (WebCore::InspectorClientWebPage::createWindow):
        (WebCore::InspectorClientQt::createPage):
        (WebCore::InspectorClientQt::showWindow):
        (WebCore::InspectorClientQt::closeWindow):
        (WebCore::InspectorClientQt::attachWindow):
        (WebCore::InspectorClientQt::detachWindow):
        (WebCore::InspectorClientQt::updateWindowTitle):
        * WebCoreSupport/InspectorClientQt.h:
        * docs/webkitsnippets/qtwebkit_qwebinspector_snippet.cpp: Added.

2009-09-10  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Reviewed by Eric Seidel.

        [Qt] Fix comparison between signed and unsigned integer warnings
        https://bugs.webkit.org/show_bug.cgi?id=29162

        No functional change.

        * Api/qwebelement.cpp:
        (QWebElement::findAll):
        * Api/qwebhistory.cpp:
        (QWebHistory::items):
        (QWebHistory::backItems):
        (QWebHistory::forwardItems):
        (QWebHistory::saveState):
        * Api/qwebplugindatabase.cpp:
        (QWebPluginDatabase::setSearchPaths):
        * WebCoreSupport/ChromeClientQt.cpp:
        (WebCore::ChromeClientQt::runOpenPanel):
        * WebCoreSupport/FrameLoaderClientQt.cpp:
        (WebCore::FrameLoaderClientQt::createPlugin):

2009-09-10  Simon Hausmann  <hausmann@webkit.org>

        Rubber-stamped by Ariya Hidayat.

        Fix a bunch of qdoc warnings: Invalid references, non-standard
        wording, etc.

        * Api/qwebelement.cpp:
        * Api/qwebgraphicsitem.cpp:
        * Api/qwebsecurityorigin.cpp:

2009-09-10  Simon Hausmann  <hausmann@webkit.org>

        Reviewed by Ariya Hidayat.

        Fix context menu event delivery with QWebGraphicsItem.

        Re-implement the correct context menu virtual function using
        a QGraphicsSceneContextMenuEvent and forward & handle it in
        QWebPage.

        * Api/qwebgraphicsitem.cpp:
        (QWebGraphicsItem::contextMenuEvent):
        * Api/qwebgraphicsitem.h:
        * Api/qwebpage.cpp:
        (QWebPagePrivate::contextMenuEvent):
        (QWebPage::event):
        * Api/qwebpage_p.h:

2009-09-10  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Unreviewed.

        Build fix for QtWebKit for Mac after r48219.

        qevent and qstyleoption are QtGui interfaces.

        * Api/qwebgraphicsitem.cpp:
        * Api/qwebgraphicsitem.h:

2009-09-09  Simon Hausmann  <hausmann@webkit.org>

        Reviewed by Tor Arne Vestbø.

        Call the right base class function QGraphicsWidget::event() instead
        of skipping it and using QObject::event() instead.

        * Api/qwebgraphicsitem.cpp:
        (QWebGraphicsItem::event):

2009-09-09  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Unreviewed.

        Fix comment at Tor Arne Vestbø's request.

        * Api/qwebgraphicsitem.cpp:
        (QWebGraphicsItem::sceneEvent):
        (QWebGraphicsItem::event):

2009-09-09  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Reviewed by Tor Arne Vestbø.

        Implement some virtual event methods so that we can fix
        event-related bugs in Qt patch releases.

        * Api/qwebgraphicsitem.cpp:
        (QWebGraphicsItem::sceneEvent):
        (QWebGraphicsItem::event):
        * Api/qwebgraphicsitem.h:

2009-09-09  Kenneth Rohde Christiansen  <kenneth@webkit.org>, Antonio Gomes  <antonio.gomes@openbossa.org>

        Reviewed by Simon Hausmann.

        Add a new QGraphicsWidget based version of the "QWebView"
        under the name "QWebGraphicsItem".

        https://bugs.webkit.org/show_bug.cgi?id=28862

        Includes an alternative Qt launcher using the QGraphicsView.

        * Api/headers.pri:
        * Api/qwebgraphicsitem.cpp: Added.
        * Api/qwebgraphicsitem.h: Added.
        * Api/qwebpage.h:
        * QGVLauncher/QGVLauncher.pro: Copied from WebKit/qt/QtLauncher/QtLauncher.pro.
        * QGVLauncher/main.cpp: Added.
        * WebCoreSupport/ChromeClientQt.cpp:
        (WebCore::ChromeClientQt::repaint):
        (WebCore::ChromeClientQt::scroll):

2009-09-08  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Unreviewed build fix.

        Potential build fix for Qt 4.5

        * Api/qwebpage.cpp:
        (QWebPagePrivate::mousePressEvent):

2009-09-08  Benjamin Poulain  <benjamin.poulain@nokia.com>

        Reviewed by Simon Hausmann.

        https://bugs.webkit.org/show_bug.cgi?id=29007
        Add a test for the signal QWebFrame::javaScriptWindowObjectCleared()

        * tests/qwebframe/tst_qwebframe.cpp:

2009-09-08  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Reviewed by Simon Hausmann.

        [Qt] Fix unused variable warnings
        https://bugs.webkit.org/show_bug.cgi?id=29018

        * Api/qwebpage.cpp:
        (QWebPagePrivate::keyPressEvent):
        * WebCoreSupport/FrameLoaderClientQt.cpp:
        (WebCore::FrameLoaderClientQt::startDownload):
        (WebCore::FrameLoaderClientQt::createFrame):

2009-09-08  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Reviewed by Ariya Hidayat.

        [Qt] Use the declaration order in initializer lists
        https://bugs.webkit.org/show_bug.cgi?id=29017

        * Api/qwebframe_p.h:

2009-09-08  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Reviewed by Simon Hausmann.

        Add support for handling QGraphicsScene events.

        * Api/qwebpage.cpp:
        (QWebPagePrivate::mouseMoveEvent):
        (QWebPagePrivate::mousePressEvent):
        (QWebPagePrivate::mouseDoubleClickEvent):
        (QWebPagePrivate::mouseTripleClickEvent):
        (QWebPagePrivate::handleClipboard):
        (QWebPagePrivate::mouseReleaseEvent):
        (QWebPagePrivate::wheelEvent):
        (QWebPagePrivate::dragEnterEvent):
        (QWebPagePrivate::dragLeaveEvent):
        (QWebPagePrivate::dragMoveEvent):
        (QWebPagePrivate::dropEvent):
        (QWebPage::event):
        * Api/qwebpage_p.h:

2009-09-08  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Reviewed by Simon Hausmann.

        [Qt] Make cursor set cleaner in QtWebKit Api: eliminate SetCursorEvent hack.
        https://bugs.webkit.org/show_bug.cgi?id=28865

        Clean up the unserCursor hack to use the QCursor set
        as a property of the QWidget by WebCore::WidgetQt.

        Remove all code that are no longer necessary for getting
        cursor change events.

        Patch by Kenneth Rohde Christiansen <kenneth@webkit.org> and
                 Antonio Gomes <antonio.gomes@openbossa.org> on 2009-09-07

        * Api/qwebpage.cpp:
        * Api/qwebpage_p.h:
        * Api/qwebview.cpp:
        (QWebViewPrivate::QWebViewPrivate):
        (QWebView::event):

2009-09-08  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Reviewed by Simon Hausmann.

        [Qt] QtWebKit single API to enable persistency
        https://bugs.webkit.org/show_bug.cgi?id=28682

        Disable LocalStorage, ApplicationCache, HTML5 offline storage by
        default.

        If persistency is enabled the default directory for LocalStorage and
        ApplicationCache is now based on QDesktopServices::DataLocation and not
        QDesktopServices::CacheLocation (as it is expected to keep this data
        around after a reboot).

        If persistency is enabled initialize HTML5 offline storage as well - this
        fixed offline Storage for QtLauncher.

        * Api/qwebpage.cpp:
        (QWebPagePrivate::QWebPagePrivate):
        * Api/qwebsettings.cpp:
        (QWebSettings::QWebSettings):
        (QWebSettings::enablePersistentStorage):
        * Api/qwebsettings.h: Add a new API called enablePersistentStorage
        * QtLauncher/main.cpp: Use the new enablePersistentStorage API
        (main):

2009-09-07  Jakub Wieczorek  <faw217@gmail.com>

        Reviewed by Simon Hausmann.

        Speed up the QWebPluginInfo::supportsMimeType() function.
        https://bugs.webkit.org/show_bug.cgi?id=27651

        Instead of going through the MIME types list constructed with
        mimeTypes() function, look up the internal mimeToDescriptions map.

        * Api/qwebplugindatabase.cpp:
        (QWebPluginInfo::supportsMimeType):

2009-09-07  Jakub Wieczorek  <faw217@gmail.com>

        Reviewed by Simon Hausmann.

        Speed up the QWebPluginInfo::mimeTypes() function.
        https://bugs.webkit.org/show_bug.cgi?id=27651

        Instead of constructing a list of MIME types every time it is called,
        do this only once.

        * Api/qwebplugindatabase.cpp:
        (QWebPluginInfo::mimeTypes):
        (QWebPluginInfo::operator=):
        * Api/qwebplugindatabase.h:
        * tests/qwebplugindatabase/tst_qwebplugindatabase.cpp:
        (tst_QWebPluginDatabase::operatorassign_data):
        (tst_QWebPluginDatabase::operatorassign):

2009-09-07  Jakub Wieczorek  <faw217@gmail.com>

        Reviewed by Simon Hausmann.

        Remove the private classes from QWebPluginDatabase.
        https://bugs.webkit.org/show_bug.cgi?id=27651

        Instead, hold the PluginDatabase and PluginPackage objects as class
        members and take care of refcounting on our own instead of using RefPtr.

        This way we not only made the code cleaner but also got rid of
        redundant allocations when constructing null QWebPluginInfo objects.

        The private classes have been forward-declared and the d-pointers left
        to be on the safe side.

        * Api/qwebplugindatabase.cpp:
        (QWebPluginInfo::QWebPluginInfo):
        (QWebPluginInfo::~QWebPluginInfo):
        (QWebPluginInfo::name):
        (QWebPluginInfo::description):
        (QWebPluginInfo::mimeTypes):
        (QWebPluginInfo::path):
        (QWebPluginInfo::isNull):
        (QWebPluginInfo::setEnabled):
        (QWebPluginInfo::isEnabled):
        (QWebPluginInfo::operator==):
        (QWebPluginInfo::operator!=):
        (QWebPluginInfo::operator=):
        (QWebPluginDatabase::QWebPluginDatabase):
        (QWebPluginDatabase::~QWebPluginDatabase):
        (QWebPluginDatabase::plugins):
        (QWebPluginDatabase::searchPaths):
        (QWebPluginDatabase::setSearchPaths):
        (QWebPluginDatabase::addSearchPath):
        (QWebPluginDatabase::refresh):
        (QWebPluginDatabase::pluginForMimeType):
        (QWebPluginDatabase::setPreferredPluginForMimeType):
        * Api/qwebplugindatabase.h:
        * Api/qwebplugindatabase_p.h: Removed.

2009-09-05  Jakub Wieczorek  <faw217@gmail.com>

        Reviewed by Eric Seidel.

        [Qt] r47424 broke binary compatibility
        https://bugs.webkit.org/show_bug.cgi?id=28996

        Append the new DnsPrefetchEnabled attribute at the end of the enum.

        * Api/qwebsettings.h:

2009-09-04  Mark Mentovai  <mark@chromium.org>

        Reviewed by Dave Hyatt.

        https://bugs.webkit.org/show_bug.cgi?id=28614

        Account for scrollbar state changes that occur during layout.

        * Api/qwebframe.cpp:
        (QWebFrame::setScrollBarPolicy):

        Eliminate duplicated (and incorrect) scrollbar mode tracking between
        FrameView and ScrollView.

2009-09-04  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Reviewed by Eric Seidel.

        [Qt] Fix tst_QWebPage::database autotest failure
        https://bugs.webkit.org/show_bug.cgi?id=28961

        Make sure that the test case enables the feature before
        the feature gets tested

        * tests/qwebpage/tst_qwebpage.cpp:
        (tst_QWebPage::database):

2009-09-04  Benjamin C Meyer  <benjamin.meyer@torchmobile.com>

        Reviewed by Eric Seidel.

        Any QtWebKit application crashes on exit if the inspector is
        used during the session rather then exiting.

        If a QWebView has a QWebPage that is destroyed the QWebView
        does not update its pointer and will crash the next time
        it access the page pointers (such as in its destructor).

        InspectorClientView should not call deleteLater when the page
        is destroyed because it does not have a parent and is a top
        level widget.  close() needs to be called so that QApplication
        can exit the application if quitOnLastWindowClosed is set
        and a InspectorClientView is the last window, otherwise
        the application will never exit.

        * Api/qwebview.cpp:
        (QWebViewPrivate::_q_pageDestroyed):
        (QWebView::setPage):
        * Api/qwebview.h:
        * WebCoreSupport/InspectorClientQt.cpp:
        (WebCore::InspectorClientView::InspectorClientView):

2009-09-03  Adam Barth  <abarth@webkit.org>

        Reviewed by eric@webkit.org.

        https://bugs.webkit.org/show_bug.cgi?id=24696

        Stub implementations of mixed content methods of FrameLoaderClient.

        * WebCoreSupport/FrameLoaderClientQt.cpp:
        (WebCore::FrameLoaderClientQt::didDisplayInsecureContent):
        (WebCore::FrameLoaderClientQt::didRunInsecureContent):
        * WebCoreSupport/FrameLoaderClientQt.h:

2009-09-03  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Reviewed by Eric Seidel.

        [Qt] Add a setting to turn SessionStorage on/off
        https://bugs.webkit.org/show_bug.cgi?id=28836

        * Api/qwebsettings.cpp:
        (QWebSettingsPrivate::apply):
        (QWebSettings::QWebSettings):
        * Api/qwebsettings.h:
        * tests/qwebpage/tst_qwebpage.cpp:
        (testFlag):
        (tst_QWebPage::testOptionalJSObjects):

2009-09-02  Richard Moore  <rich@kde.org>

        Reviewed by Tor Arne Vestbø.

        [Qt] Make sure we relayout the page after evaluating JS

        https://bugs.webkit.org/show_bug.cgi?id=28235

        QtWebKit does not always seem to reflow the page when evaluating
        javascript. This patch changes the way evaluateJavaScript works to
        use the frameloader which ensures that this is done properly.

        * Api/qwebframe.cpp:
        (QWebFrame::evaluateJavaScript):
        * tests/qwebframe/tst_qwebframe.cpp:

2009-08-28  Gustavo Noronha Silva  <gustavo.noronha@collabora.co.uk>

        Reviewed by Holger Freyther.

        https://bugs.webkit.org/show_bug.cgi?id=25889
        [GTK] scrollbar policy for main frame is not implementable

        Add empty implementation for new ChromeClient method.

        * WebCoreSupport/ChromeClientQt.h:
        (WebCore::ChromeClientQt::scrollbarsModeDidChange):

2009-08-27  Jedrzej Nowacki  <jedrzej.nowacki@nokia.com>

        Reviewed by Ariya Hidayat.

        QWebHistory::clear() modifications.

        Clear() method was changed. If QWebHistory is empty (there is no
        elements even current) clear() do nothing. If there at least one
        element clear() will delete everything apart of current.

        New autotests in QWebHistory

        New autotests were added to QWebHistory. They should check some crashes
        in save and restore state process and clear() method and general
        behavior on where QWebHistory::count() == 0 or QWebHistory::count() == 1

        Bugzilla: https://bugs.webkit.org/show_bug.cgi?id=28711

        * Api/qwebhistory.cpp:
        (QWebHistory::clear):
        * tests/qwebhistory/tst_qwebhistory.cpp:
        (tst_QWebHistory::back):
        (tst_QWebHistory::forward):
        (tst_QWebHistory::saveAndRestore_crash_1):
        (tst_QWebHistory::saveAndRestore_crash_2):
        (tst_QWebHistory::saveAndRestore_crash_3):
        (tst_QWebHistory::clear):

2009-08-27  Jedrzej Nowacki  <jedrzej.nowacki@nokia.com>

        Reviewed by Ariya Hidayat.

        [Qt] Cleanup, old and commented part of source code was removed.
        Fix some formatting problems.

        https://bugs.webkit.org/show_bug.cgi?id=28712

        * Api/qwebhistory_p.h:
        (QWebHistoryPrivate::QWebHistoryPrivate):

2009-08-26  Adam Barth  <abarth@webkit.org>

        Reviewed by Oliver Hunt.

        Don't let local files access web URLs
        https://bugs.webkit.org/show_bug.cgi?id=28480

        * Api/qwebsettings.cpp:
        (QWebSettings::QWebSettings):

2009-08-25  Antonio Gomes   <antonio.gomes@openbossa.org>

        Reviewed by Ariya Hidayat.

        Bug 28708 - Make possible to better use ResourceError in FrameLoaderClientQt class.

        * Api/qwebframe.cpp:
        (QWebFrame::requestedUrl):
        * WebCoreSupport/FrameLoaderClientQt.cpp:
        (WebCore::FrameLoaderClientQt::FrameLoaderClientQt):
        (WebCore::FrameLoaderClientQt::dispatchDidFinishLoad):
        (WebCore::FrameLoaderClientQt::postProgressFinishedNotification):
        (WebCore::FrameLoaderClientQt::dispatchDidFailProvisionalLoad):
        (WebCore::FrameLoaderClientQt::dispatchDidFailLoad):
        * WebCoreSupport/FrameLoaderClientQt.h:

2009-08-22  Adam Barth  <abarth@webkit.org>

        Revert 47684.  We're going to do this later once clients have had a
        chance to opt into the setting they like.

        * Api/qwebsettings.cpp:
        (QWebSettings::QWebSettings):

2009-08-22  Adam Barth  <abarth@webkit.org>

        Reviewed by Eric Seidel.

        Don't let local files access web URLs
        https://bugs.webkit.org/show_bug.cgi?id=28480

        * Api/qwebsettings.cpp:
        (QWebSettings::QWebSettings):

2009-08-19  Aaron Boodman  <aa@chromium.org>

        Speculative build break fix for qt.

        * Api/qwebsecurityorigin.cpp:
        (QWebSecurityOrigin::whiteListAccessFromOrigin):
        * Api/qwebsecurityorigin.h:

2009-08-19  Aaron Boodman  <aa@chromium.org>

        Reviewed by David Levin.

        https://bugs.webkit.org/show_bug.cgi?id=24853: Provide a way for WebKit clients to
        specify a more granular policy for cross-origin XHR access.

        * Api/qwebsecurityorigin.cpp: Add API to manipulate origin access whitelists.
        (QWebSecurityOrigin::whiteListAccessFromOrigin): Ditto.
        (QWebSecurityOrigin::resetOriginAccessWhiteLists): Ditto.
        * Api/qwebsecurityorigin.h: Ditto.

2009-08-18  Markus Goetz <Markus.Goetz@nokia.com>

        Reviwed by Ariya Hidayat.

        [Qt] For prefecthDNS, the pre-fetching has to be enabled in the
        WebSettings.

        * Api/qwebsettings.cpp:
        (QWebSettings::QWebSettings):
        * Api/qwebsettings.h:

2009-08-17  Darin Adler  <darin@apple.com>

        Try to fix Qt build again.

        * WebCoreSupport/EditorClientQt.cpp: Move "using namespace".

2009-08-17  Darin Adler  <darin@apple.com>

        Try to fix Qt build.

        * WebCoreSupport/EditorClientQt.cpp:
        (WebCore::EditorClientQt::shouldShowDeleteInterface):
        Use getAttribute(classAttr) instead of className() function.

2009-08-14  Yongjun Zhang  <yongjun.zhang@nokia.com>

        Reviewed by Simon Hausmann.

        RVCT elftran fails to resolve QPainter::staticMetaObject coming with
        QWebView::RenderHints property.

        This is a temporary fix and will be revereted when the right symbols
        exported from Qt lib in S60.

        https://bugs.webkit.org/show_bug.cgi?id=28181

        * Api/qwebview.h:

2009-08-14  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Reviewed by Simon Hausmann.

        [Qt] Public API to configure the storage path for HTML5 localStorage
        https://bugs.webkit.org/show_bug.cgi?id=28036

        Disables LocalStorage for QtWebKit by default by setting
        QWebSettings::LocalStorageEnabled to false.

        Sets up a default for the LocalStorage path so that clients would only
        need to enable the LocalStorageEnabled setting to turn on LocalStoragre
        support.

        Turn on LocalStorage support for QtLauncher and the relevant test
        since LocalStorage is now disabled by default for QtWebkit.

        * Api/qwebpage.cpp:
        (defaultCachePath):
        (initializeApplicationCachePathIfNecessary):
        (QWebPagePrivate::QWebPagePrivate):
        * Api/qwebsettings.cpp:
        (QWebSettingsPrivate::apply):
        (QWebSettings::QWebSettings):
        (QWebSettings::setLocalStoragePath):
        (QWebSettings::localStoragePath):
        * Api/qwebsettings.h:
        * QtLauncher/main.cpp:
        (main):
        * tests/qwebpage/tst_qwebpage.cpp:
        (tst_QWebPage::multiplePageGroupsAndLocalStorage):

2009-08-14  Yael Aharon  <yael.aharon@nokia.com>

        Reviewed by Simon Hausmann.

        [Qt] Allow applications to register their own local URL scheme.
        https://bugs.webkit.org/show_bug.cgi?id=28240

        * Api/qwebsecurityorigin.cpp:
        (QWebSecurityOrigin::addLocalScheme):
        (QWebSecurityOrigin::removeLocalScheme):
        (QWebSecurityOrigin::localSchemes):
        * Api/qwebsecurityorigin.h:
        * tests/qwebpage/tst_qwebpage.cpp:
        (tst_QWebPage::localURLSchemes):

2009-08-13  Mark Rowe  <mrowe@apple.com>

        Try and fix the Qt build.

        * Api/qwebelement.cpp:

2009-08-13  Kavindra Devi Palaraja  <kavindra.palaraja@nokia.com>

        Reviewed by Simon Hausmann.

        Doc - Some cleanup on the documentation of QWebElement

        * Api/qwebelement.cpp:

2009-08-13  Norbert Leser  <norbert.leser@nokia.com>

        Reviewed by Simon Hausmann.

        Symbian target components (library and executable files)
        require Unique Identifiers (i.e., UID3).
        These identifiers are defined in the respective project
        files, conditionally for "symbian" platform.

        * QtLauncher/QtLauncher.pro:
        * tests/qwebelement/qwebelement.pro:
        * tests/qwebframe/qwebframe.pro:
        * tests/qwebhistory/qwebhistory.pro:
        * tests/qwebhistoryinterface/qwebhistoryinterface.pro:
        * tests/qwebpage/qwebpage.pro:
        * tests/qwebview/qwebview.pro:

2009-08-12  George Wright  <george.wright@torchmobile.com>

        Reviewed by Adam Treat.

        Initialise zoom levels independent of whether a URL is valid or not to
        fix https://bugs.webkit.org/show_bug.cgi?id=28162

        * QtLauncher/main.cpp:
        (MainWindow::MainWindow):

2009-08-12  Joerg Bornemann  <joerg.bornemann@trolltech.com>

        Reviewed by Simon Hausmann.

        QtWebKit compile fix for Windows CE

        There's no getenv on Windows CE, use qgetenv instead.

        * Api/qwebpage.cpp:
        (qt_drt_overwritePluginDirectories):

2009-08-10  Kavindra Palaraja  <kavindra.palaraja@nokia.com>

        Reviewed by Simon Hausmann.

        Various fixes and improvements to the QWebPluginInfo, QWebPluginDatabase and QWebSettings documentation.

        * Api/qwebplugindatabase.cpp:
        * Api/qwebsettings.cpp:

2009-08-08  Volker Hilsheimer  <volker.hilsheimer@nokia.com>

        Reviewed by Simon Hausmann.

        Doc: there is no group of explicitly shared classes, only one class uses this.

        Explain the implications in the QWebHistoryItem documentation, and get rid
        of the "group".

        * Api/qwebhistory.cpp:

2009-08-05  Csaba Osztrogonac  <oszi@inf.u-szeged.hu>

        Reviewed by Simon Hausmann.

        [Qt] Fix build error caused by http://trac.webkit.org/changeset/46763

        * Api/qwebpluginfactory.h: Export macro added.

2009-08-04  Antonio Gomes   <antonio.gomes@openbossa.org>

        Reviewed by Simon Hausmann.

        [Qt] QWebFrame::requestedUrl method can mis-behave in case of unhandled sslErrors.
        https://bugs.webkit.org/show_bug.cgi?id=27804

        * Api/qwebframe.cpp:
        (QWebFrame::requestedUrl):
        * tests/qwebframe/tst_qwebframe.cpp:

2009-08-04  Simon Hausmann  <simon.hausmann@nokia.com>

        Reviewed by Tor Arne Vestbø.

        Rename QWebPlugin to QWebPluginInfo, as discussed on IRC.

        * Api/qwebplugindatabase.cpp:
        (QWebPluginInfoPrivate::QWebPluginInfoPrivate):
        (QWebPluginInfo::QWebPluginInfo):
        (QWebPluginInfo::~QWebPluginInfo):
        (QWebPluginInfo::name):
        (QWebPluginInfo::description):
        (QWebPluginInfo::mimeTypes):
        (QWebPluginInfo::supportsMimeType):
        (QWebPluginInfo::path):
        (QWebPluginInfo::isNull):
        (QWebPluginInfo::setEnabled):
        (QWebPluginInfo::isEnabled):
        (QWebPluginInfo::operator==):
        (QWebPluginInfo::operator!=):
        (QWebPluginInfo::operator=):
        (QWebPluginDatabase::plugins):
        (QWebPluginDatabase::pluginForMimeType):
        (QWebPluginDatabase::setPreferredPluginForMimeType):
        * Api/qwebplugindatabase.h:
        * Api/qwebplugindatabase_p.h:
        * tests/qwebplugindatabase/tst_qwebplugindatabase.cpp:
        (tst_QWebPluginDatabase::installedPlugins):
        (tst_QWebPluginDatabase::searchPaths):
        (tst_QWebPluginDatabase::null_data):
        (tst_QWebPluginDatabase::null):
        (tst_QWebPluginDatabase::pluginForMimeType):
        (tst_QWebPluginDatabase::enabled):
        (tst_QWebPluginDatabase::operatorequal_data):
        (tst_QWebPluginDatabase::operatorequal):
        (tst_QWebPluginDatabase::preferredPlugin):

2009-08-04  Simon Hausmann  <simon.hausmann@nokia.com>

        Reviewed by Adam Treat.

        Replace QWebPlugin::MimeType with a typedef to
        QWebPluginFactory::MimeType.

        * Api/qwebplugindatabase.cpp:
        * Api/qwebplugindatabase.h:
        * Api/qwebpluginfactory.cpp:
        (QWebPluginFactory::MimeType::operator==):
        * Api/qwebpluginfactory.h:

2009-08-04  Jakub Wieczorek  <faw217@gmail.com>

        Reviewed by Simon Hausmann.

        Add QWebPluginDatabase API to the Qt API.

        https://bugs.webkit.org/show_bug.cgi?id=27651

        * Api/headers.pri:
        * Api/qwebplugindatabase.cpp: Added.
        (QWebPluginPrivate::QWebPluginPrivate):
        (QWebPluginDatabasePrivate::QWebPluginDatabasePrivate):
        (QWebPlugin::MimeType::operator==):
        (QWebPlugin::QWebPlugin):
        (QWebPlugin::~QWebPlugin):
        (QWebPlugin::name):
        (QWebPlugin::description):
        (QWebPlugin::mimeTypes):
        (QWebPlugin::supportsMimeType):
        (QWebPlugin::path):
        (QWebPlugin::isNull):
        (QWebPlugin::setEnabled):
        (QWebPlugin::isEnabled):
        (QWebPlugin::operator==):
        (QWebPlugin::operator!=):
        (QWebPlugin::operator=):
        (QWebPluginDatabase::QWebPluginDatabase):
        (QWebPluginDatabase::~QWebPluginDatabase):
        (QWebPluginDatabase::plugins):
        (QWebPluginDatabase::defaultSearchPaths):
        (QWebPluginDatabase::searchPaths):
        (QWebPluginDatabase::setSearchPaths):
        (QWebPluginDatabase::addSearchPath):
        (QWebPluginDatabase::refresh):
        (QWebPluginDatabase::pluginForMimeType):
        (QWebPluginDatabase::setPreferredPluginForMimeType):
        * Api/qwebplugindatabase.h: Added.
        * Api/qwebplugindatabase_p.h: Added.
        * Api/qwebsettings.cpp:
        (QWebSettings::pluginDatabase):
        * Api/qwebsettings.h:
        * tests/qwebplugindatabase/qwebplugindatabase.pro: Added.
        * tests/qwebplugindatabase/tst_qwebplugindatabase.cpp: Added.
        (tst_QWebPluginDatabase::installedPlugins):
        (tst_QWebPluginDatabase::searchPaths):
        (tst_QWebPluginDatabase::null_data):
        (tst_QWebPluginDatabase::null):
        (tst_QWebPluginDatabase::pluginForMimeType):
        (tst_QWebPluginDatabase::enabled):
        (tst_QWebPluginDatabase::operatorequal_data):
        (tst_QWebPluginDatabase::operatorequal):
        (tst_QWebPluginDatabase::preferredPlugin):
        * tests/tests.pro:

2009-08-03  Balazs Kelemen  <kelemen.balazs.3@stud.u-szeged.hu>

        Reviewed by Simon Hausmann.

        Do memory cleanup when running robotized QtLauncher in debug as well.

        * QtLauncher/main.cpp:
        (launcherMain):
        (main):

2009-07-30  Laszlo Gombos  <laszlo.1.gombos@nokia.com>

        Reviewed by Tor Arne Vestbø.

        [Qt] Initialize HTML5 Application Cache for QtWebKit to a sensible default
        https://bugs.webkit.org/show_bug.cgi?id=27866

        * Api/qwebpage.cpp:
        (initializeApplicationCachePathIfNecessary):
        (QWebPagePrivate::QWebPagePrivate):

2009-07-31  Jakob Petsovits  <jakob.petsovits@torchmobile.com>

        Reviewed by Adam Treat.

        Build QtWebKit without benchmark tests for Qt < 4.5.
        https://bugs.webkit.org/show_bug.cgi?id=27886

        The QBENCHMARK macro is only available from 4.5 on,
        so builds for Qt < 4.5 shouldn't try to build those.

        * tests/tests.pro:

2009-07-31  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Reviewed by Adam Treat.

        Fix warning by migrating use of QString.sprintf(...) to
        QString.arg().arg()...

        * WebCoreSupport/EditorClientQt.cpp:
        (dumpRange):

2009-07-31  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Reviewed by Tor Arne Vestbø.

        Expose the Offline Web Application Cache in the Qt API.

        * Api/qwebsettings.cpp:
        (QWebSettings::QWebSettings):
        (QWebSettings::setOfflineWebApplicationCachePath):
        (QWebSettings::offlineWebApplicationCachePath):
        (QWebSettings::setOfflineWebApplicationCacheQuota):
        (QWebSettings::offlineWebApplicationCacheQuota):
        * Api/qwebsettings.h:

2009-07-30  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Reviewed by Adam Treat.

        Add missing Q_OBJECT to class inheriting from QObject.

        * tests/qwebframe/tst_qwebframe.cpp:

2009-07-30  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Reviewed by Adam Treat.

        Fix indentation.

        * tests/qwebframe/tst_qwebframe.cpp:

2009-07-30  Volker Hilsheimer <volker.hilsheimer@nokia.com>

        Reviewed by Simon Hausmann.

        Fix documentation links to examples.

        * Api/qwebview.cpp:

2009-07-30  Balazs Kelemen  <kelemen.balazs.3@stud.u-szeged.hu>

        Reviewed by Simon Hausmann.

        Allocate MainWindow on heap in robotized QtLauncher as well.

        * QtLauncher/main.cpp:
        (main):

2009-07-29  Kevin McCullough  <kmccullough@apple.com>

        Reviewed by Darin Adler.

        Added foundation work to allow a testing infrastructure for the Web
        Inspector.

        * WebCoreSupport/InspectorClientQt.cpp:
        (WebCore::InspectorClientQt::inspectorWindowObjectCleared):
        * WebCoreSupport/InspectorClientQt.h:

2009-07-29  Zoltan Herczeg  <zherczeg@inf.u-szeged.hu>

        Reviewed by Simon Hausmann.

        [Qt] In debug mode, this fix frees cached resources
        and other unreferenced objects (by calling the
        garbage collector) to remove the LEAK messages.
        https://bugs.webkit.org/show_bug.cgi?id=27767

        * Api/qwebframe.cpp:
        (qt_drt_cache_clear):
        * QtLauncher/main.cpp:
        (main):

2009-07-28  Kenneth Rohde Christiansen  <kenneth@webkit.org>

        Fix the Qt build by adapting to the changes of ScriptObject.

        * Api/qwebelement.cpp:
        (setupScriptObject):

2009-07-28  Robert Hogan  <robert@roberthogan.net>

        Reviewed by Simon Hausmann.

        Add WebKit version API to Qt.

        Get the current version of WebKit from WebKit/mac/Configurations/Version.xcconfig
        at compile time and make it available to Qt applications through
        qWebKitVersion().

        Also amend the User Agent string to place the Safari clause outside
        the final bracket and to the end of the UA string.

        https://bugs.webkit.org/show_bug.cgi?id=27158

        Minor build tweak by Simon Hausmann (adding export macros to new functions).

        * Api/headers.pri:
        * Api/qwebkitversion.cpp: Added.
        (webKitVersion):
        (webKitMajorVersion):
        (webKitMinorVersion):
        * Api/qwebkitversion.h: Added.
        * Api/qwebpage.cpp:
        (QWebPage::userAgentForUrl):
        * tests/qwebview/tst_qwebview.cpp:
        (tst_QWebView::getWebKitVersion):

        http://qt.nokia.com/developer/task-tracker/index_html?id=238391&method=entry
        http://qt.nokia.com/developer/task-tracker/index_html?id=219344&method=entry
        http://qt.nokia.com/developer/task-tracker/index_html?id=241144&method=entry

1 files changed, 233 insertions, 15 deletions

diff --git a/src/3rdparty/webkit/JavaScriptCore/wtf/FastMalloc.cpp b/src/3rdparty/webkit/JavaScriptCore/wtf/FastMalloc.cpp
index c855a41..afb0220 100644
--- a/src/3rdparty/webkit/JavaScriptCore/wtf/FastMalloc.cpp
+++ b/src/3rdparty/webkit/JavaScriptCore/wtf/FastMalloc.cpp
@@ -1,6 +1,6 @@
 // Copyright (c) 2005, 2007, Google Inc.
 // All rights reserved.
-// Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 // 
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -89,12 +89,20 @@
 #endif
 #endif
 
-#if !defined(USE_SYSTEM_MALLOC) && defined(NDEBUG)
+#if !(defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC) && defined(NDEBUG)
 #define FORCE_SYSTEM_MALLOC 0
 #else
 #define FORCE_SYSTEM_MALLOC 1
 #endif
 
+// Use a background thread to periodically scavenge memory to release back to the system
+// https://bugs.webkit.org/show_bug.cgi?id=27900: don't turn this on for Tiger until we have figured out why it caused a crash.
+#if defined(BUILDING_ON_TIGER)
+#define USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY 0
+#else
+#define USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY 1
+#endif
+
 #ifndef NDEBUG
 namespace WTF {
 
@@ -170,10 +178,10 @@ void* fastZeroedMalloc(size_t n)
     return result;
 }
     
-void* tryFastZeroedMalloc(size_t n) 
+TryMallocReturnValue tryFastZeroedMalloc(size_t n) 
 {
-    void* result = tryFastMalloc(n);
-    if (!result)
+    void* result;
+    if (!tryFastMalloc(n).getValue(result))
         return 0;
     memset(result, 0, n);
     return result;
@@ -192,7 +200,7 @@ void* tryFastZeroedMalloc(size_t n)
 
 namespace WTF {
 
-void* tryFastMalloc(size_t n) 
+TryMallocReturnValue tryFastMalloc(size_t n) 
 {
     ASSERT(!isForbidden());
 
@@ -218,7 +226,9 @@ void* fastMalloc(size_t n)
     ASSERT(!isForbidden());
 
 #if ENABLE(FAST_MALLOC_MATCH_VALIDATION)
-    void* result = tryFastMalloc(n);
+    TryMallocReturnValue returnValue = tryFastMalloc(n);
+    void* result;
+    returnValue.getValue(result);
 #else
     void* result = malloc(n);
 #endif
@@ -228,7 +238,7 @@ void* fastMalloc(size_t n)
     return result;
 }
 
-void* tryFastCalloc(size_t n_elements, size_t element_size)
+TryMallocReturnValue tryFastCalloc(size_t n_elements, size_t element_size)
 {
     ASSERT(!isForbidden());
 
@@ -256,7 +266,9 @@ void* fastCalloc(size_t n_elements, size_t element_size)
     ASSERT(!isForbidden());
 
 #if ENABLE(FAST_MALLOC_MATCH_VALIDATION)
-    void* result = tryFastCalloc(n_elements, element_size);
+    TryMallocReturnValue returnValue = tryFastCalloc(n_elements, element_size);
+    void* result;
+    returnValue.getValue(result);
 #else
     void* result = calloc(n_elements, element_size);
 #endif
@@ -283,7 +295,7 @@ void fastFree(void* p)
 #endif
 }
 
-void* tryFastRealloc(void* p, size_t n)
+TryMallocReturnValue tryFastRealloc(void* p, size_t n)
 {
     ASSERT(!isForbidden());
 
@@ -315,7 +327,9 @@ void* fastRealloc(void* p, size_t n)
     ASSERT(!isForbidden());
 
 #if ENABLE(FAST_MALLOC_MATCH_VALIDATION)
-    void* result = tryFastRealloc(p, n);
+    TryMallocReturnValue returnValue = tryFastRealloc(p, n);
+    void* result;
+    returnValue.getValue(result);
 #else
     void* result = realloc(p, n);
 #endif
@@ -531,7 +545,7 @@ static const size_t kNumClasses = 68;
 static const size_t kPageMapBigAllocationThreshold = 128 << 20;
 
 // Minimum number of pages to fetch from system at a time.  Must be
-// significantly bigger than kBlockSize to amortize system-call
+// significantly bigger than kPageSize to amortize system-call
 // overhead, and also to reduce external fragementation.  Also, we
 // should keep this value big because various incarnations of Linux
 // have small limits on the number of mmap() regions per
@@ -1187,6 +1201,32 @@ template <> class MapSelector<32> {
 // contiguous runs of pages (called a "span").
 // -------------------------------------------------------------------------
 
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+// The central page heap collects spans of memory that have been deleted but are still committed until they are released
+// back to the system.  We use a background thread to periodically scan the list of free spans and release some back to the
+// system.  Every 5 seconds, the background thread wakes up and does the following:
+// - Check if we needed to commit memory in the last 5 seconds.  If so, skip this scavenge because it's a sign that we are short
+// of free committed pages and so we should not release them back to the system yet.
+// - Otherwise, go through the list of free spans (from largest to smallest) and release up to a fraction of the free committed pages
+// back to the system.
+// - If the number of free committed pages reaches kMinimumFreeCommittedPageCount, we can stop the scavenging and block the
+// scavenging thread until the number of free committed pages goes above kMinimumFreeCommittedPageCount.
+
+// Background thread wakes up every 5 seconds to scavenge as long as there is memory available to return to the system.
+static const int kScavengeTimerDelayInSeconds = 5;
+
+// Number of free committed pages that we want to keep around.
+static const size_t kMinimumFreeCommittedPageCount = 512;
+
+// During a scavenge, we'll release up to a fraction of the free committed pages.
+#if PLATFORM(WIN)
+// We are slightly less aggressive in releasing memory on Windows due to performance reasons.
+static const int kMaxScavengeAmountFactor = 3;
+#else
+static const int kMaxScavengeAmountFactor = 2;
+#endif
+#endif
+
 class TCMalloc_PageHeap {
  public:
   void init();
@@ -1286,6 +1326,14 @@ class TCMalloc_PageHeap {
   // Bytes allocated from system
   uint64_t system_bytes_;
 
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+  // Number of pages kept in free lists that are still committed.
+  Length free_committed_pages_;
+
+  // Number of pages that we committed in the last scavenge wait interval.
+  Length pages_committed_since_last_scavenge_;
+#endif
+
   bool GrowHeap(Length n);
 
   // REQUIRES   span->length >= n
@@ -1308,9 +1356,11 @@ class TCMalloc_PageHeap {
   // span of exactly the specified length.  Else, returns NULL.
   Span* AllocLarge(Length n);
 
+#if !USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
   // Incrementally release some memory to the system.
   // IncrementalScavenge(n) is called whenever n pages are freed.
   void IncrementalScavenge(Length n);
+#endif
 
   // Number of pages to deallocate before doing more scavenging
   int64_t scavenge_counter_;
@@ -1321,6 +1371,24 @@ class TCMalloc_PageHeap {
 #if defined(WTF_CHANGES) && PLATFORM(DARWIN)
   friend class FastMallocZone;
 #endif
+
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+  static NO_RETURN void* runScavengerThread(void*);
+
+  NO_RETURN void scavengerThread();
+
+  void scavenge();
+
+  inline bool shouldContinueScavenging() const;
+
+  pthread_mutex_t m_scavengeMutex;
+
+  pthread_cond_t m_scavengeCondition;
+
+  // Keeps track of whether the background thread is actively scavenging memory every kScavengeTimerDelayInSeconds, or
+  // it's blocked waiting for more pages to be deleted.
+  bool m_scavengeThreadActive;
+#endif  // USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
 };
 
 void TCMalloc_PageHeap::init()
@@ -1329,6 +1397,12 @@ void TCMalloc_PageHeap::init()
   pagemap_cache_ = PageMapCache(0);
   free_pages_ = 0;
   system_bytes_ = 0;
+
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+  free_committed_pages_ = 0;
+  pages_committed_since_last_scavenge_ = 0;
+#endif  // USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+
   scavenge_counter_ = 0;
   // Start scavenging at kMaxPages list
   scavenge_index_ = kMaxPages-1;
@@ -1339,8 +1413,68 @@ void TCMalloc_PageHeap::init()
     DLL_Init(&free_[i].normal);
     DLL_Init(&free_[i].returned);
   }
+
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+  pthread_mutex_init(&m_scavengeMutex, 0);
+  pthread_cond_init(&m_scavengeCondition, 0);
+  m_scavengeThreadActive = true;
+  pthread_t thread;
+  pthread_create(&thread, 0, runScavengerThread, this);
+#endif  // USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+}
+
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+void* TCMalloc_PageHeap::runScavengerThread(void* context)
+{
+  static_cast<TCMalloc_PageHeap*>(context)->scavengerThread();
+#if COMPILER(MSVC)
+  // Without this, Visual Studio will complain that this method does not return a value.
+  return 0;
+#endif
 }
 
+void TCMalloc_PageHeap::scavenge() 
+{
+    // If we have to commit memory in the last 5 seconds, it means we don't have enough free committed pages
+    // for the amount of allocations that we do.  So hold off on releasing memory back to the system.
+    if (pages_committed_since_last_scavenge_ > 0) {
+        pages_committed_since_last_scavenge_ = 0;
+        return;
+    }
+    Length pagesDecommitted = 0;
+    for (int i = kMaxPages; i >= 0; i--) {
+        SpanList* slist = (static_cast<size_t>(i) == kMaxPages) ? &large_ : &free_[i];
+        if (!DLL_IsEmpty(&slist->normal)) {
+            // Release the last span on the normal portion of this list
+            Span* s = slist->normal.prev; 
+            // Only decommit up to a fraction of the free committed pages if pages_allocated_since_last_scavenge_ > 0.
+            if ((pagesDecommitted + s->length) * kMaxScavengeAmountFactor > free_committed_pages_)
+                continue;
+            DLL_Remove(s);
+            TCMalloc_SystemRelease(reinterpret_cast<void*>(s->start << kPageShift),
+                                   static_cast<size_t>(s->length << kPageShift));
+            if (!s->decommitted) {
+                pagesDecommitted += s->length;
+                s->decommitted = true;
+            }
+            DLL_Prepend(&slist->returned, s);
+            // We can stop scavenging if the number of free committed pages left is less than or equal to the minimum number we want to keep around.
+            if (free_committed_pages_ <= kMinimumFreeCommittedPageCount + pagesDecommitted)
+                break;
+        }
+    }
+    pages_committed_since_last_scavenge_ = 0;
+    ASSERT(free_committed_pages_ >= pagesDecommitted);
+    free_committed_pages_ -= pagesDecommitted;
+}
+
+inline bool TCMalloc_PageHeap::shouldContinueScavenging() const 
+{
+    return free_committed_pages_ > kMinimumFreeCommittedPageCount; 
+}
+
+#endif  // USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+
 inline Span* TCMalloc_PageHeap::New(Length n) {
   ASSERT(Check());
   ASSERT(n > 0);
@@ -1366,7 +1500,18 @@ inline Span* TCMalloc_PageHeap::New(Length n) {
     if (result->decommitted) {
         TCMalloc_SystemCommit(reinterpret_cast<void*>(result->start << kPageShift), static_cast<size_t>(n << kPageShift));
         result->decommitted = false;
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+        pages_committed_since_last_scavenge_ += n;
+#endif
+    }
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+    else {
+        // The newly allocated memory is from a span that's in the normal span list (already committed).  Update the
+        // free committed pages count.
+        ASSERT(free_committed_pages_ >= n);
+        free_committed_pages_ -= n;
     }
+#endif  // USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
     ASSERT(Check());
     free_pages_ -= n;
     return result;
@@ -1426,7 +1571,18 @@ Span* TCMalloc_PageHeap::AllocLarge(Length n) {
     if (best->decommitted) {
         TCMalloc_SystemCommit(reinterpret_cast<void*>(best->start << kPageShift), static_cast<size_t>(n << kPageShift));
         best->decommitted = false;
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+        pages_committed_since_last_scavenge_ += n;
+#endif
+    }
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+    else {
+        // The newly allocated memory is from a span that's in the normal span list (already committed).  Update the
+        // free committed pages count.
+        ASSERT(free_committed_pages_ >= n);
+        free_committed_pages_ -= n;
     }
+#endif  // USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
     ASSERT(Check());
     free_pages_ -= n;
     return best;
@@ -1508,6 +1664,10 @@ inline void TCMalloc_PageHeap::Delete(Span* span) {
   // necessary.  We do not bother resetting the stale pagemap
   // entries for the pieces we are merging together because we only
   // care about the pagemap entries for the boundaries.
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+  // Track the total size of the neighboring free spans that are committed.
+  Length neighboringCommittedSpansLength = 0;
+#endif
   const PageID p = span->start;
   const Length n = span->length;
   Span* prev = GetDescriptor(p-1);
@@ -1515,6 +1675,10 @@ inline void TCMalloc_PageHeap::Delete(Span* span) {
     // Merge preceding span into this span
     ASSERT(prev->start + prev->length == p);
     const Length len = prev->length;
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+    if (!prev->decommitted)
+        neighboringCommittedSpansLength += len;
+#endif
     mergeDecommittedStates(span, prev);
     DLL_Remove(prev);
     DeleteSpan(prev);
@@ -1528,6 +1692,10 @@ inline void TCMalloc_PageHeap::Delete(Span* span) {
     // Merge next span into this span
     ASSERT(next->start == p+n);
     const Length len = next->length;
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+    if (!next->decommitted)
+        neighboringCommittedSpansLength += len;
+#endif
     mergeDecommittedStates(span, next);
     DLL_Remove(next);
     DeleteSpan(next);
@@ -1551,10 +1719,27 @@ inline void TCMalloc_PageHeap::Delete(Span* span) {
   }
   free_pages_ += n;
 
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+  if (span->decommitted) {
+      // If the merged span is decommitted, that means we decommitted any neighboring spans that were
+      // committed.  Update the free committed pages count.
+      free_committed_pages_ -= neighboringCommittedSpansLength;
+  } else {
+      // If the merged span remains committed, add the deleted span's size to the free committed pages count.
+      free_committed_pages_ += n;
+  }
+
+  // Make sure the scavenge thread becomes active if we have enough freed pages to release some back to the system.
+  if (!m_scavengeThreadActive && shouldContinueScavenging())
+      pthread_cond_signal(&m_scavengeCondition);
+#else
   IncrementalScavenge(n);
+#endif
+
   ASSERT(Check());
 }
 
+#if !USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
 void TCMalloc_PageHeap::IncrementalScavenge(Length n) {
   // Fast path; not yet time to release memory
   scavenge_counter_ -= n;
@@ -1592,6 +1777,7 @@ void TCMalloc_PageHeap::IncrementalScavenge(Length n) {
   // Nothing to scavenge, delay for a while
   scavenge_counter_ = kDefaultReleaseDelay;
 }
+#endif
 
 void TCMalloc_PageHeap::RegisterSizeClass(Span* span, size_t sc) {
   // Associate span object with all interior pages as well
@@ -1703,6 +1889,10 @@ bool TCMalloc_PageHeap::GrowHeap(Length n) {
   }
   ask = actual_size >> kPageShift;
 
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+  pages_committed_since_last_scavenge_ += ask;
+#endif
+
   uint64_t old_system_bytes = system_bytes_;
   system_bytes_ += (ask << kPageShift);
   const PageID p = reinterpret_cast<uintptr_t>(ptr) >> kPageShift;
@@ -2083,6 +2273,34 @@ static inline TCMalloc_PageHeap* getPageHeap()
 
 #define pageheap getPageHeap()
 
+#if USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY
+#if PLATFORM(WIN)
+static void sleep(unsigned seconds)
+{
+    ::Sleep(seconds * 1000);
+}
+#endif
+
+void TCMalloc_PageHeap::scavengerThread()
+{
+  while (1) {
+      if (!shouldContinueScavenging()) {
+          pthread_mutex_lock(&m_scavengeMutex);
+          m_scavengeThreadActive = false;
+          // Block until there are enough freed pages to release back to the system.
+          pthread_cond_wait(&m_scavengeCondition, &m_scavengeMutex);
+          m_scavengeThreadActive = true;
+          pthread_mutex_unlock(&m_scavengeMutex);
+      }
+      sleep(kScavengeTimerDelayInSeconds);
+      {
+          SpinLockHolder h(&pageheap_lock);
+          pageheap->scavenge();
+      }
+  }
+}
+#endif
+
 // If TLS is available, we also store a copy
 // of the per-thread object in a __thread variable
 // since __thread variables are faster to read
@@ -3364,7 +3582,7 @@ void* fastMalloc(size_t size)
     return malloc<true>(size);
 }
 
-void* tryFastMalloc(size_t size)
+TryMallocReturnValue tryFastMalloc(size_t size)
 {
     return malloc<false>(size);
 }
@@ -3425,7 +3643,7 @@ void* fastCalloc(size_t n, size_t elem_size)
     return calloc<true>(n, elem_size);
 }
 
-void* tryFastCalloc(size_t n, size_t elem_size)
+TryMallocReturnValue tryFastCalloc(size_t n, size_t elem_size)
 {
     return calloc<false>(n, elem_size);
 }
@@ -3489,7 +3707,7 @@ void* fastRealloc(void* old_ptr, size_t new_size)
     return realloc<true>(old_ptr, new_size);
 }
 
-void* tryFastRealloc(void* old_ptr, size_t new_size)
+TryMallocReturnValue tryFastRealloc(void* old_ptr, size_t new_size)
 {
     return realloc<false>(old_ptr, new_size);
 }