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diff --git a/src/3rdparty/webkit/JavaScriptCore/API/JSContextRef.cpp b/src/3rdparty/webkit/JavaScriptCore/API/JSContextRef.cpp
new file mode 100644
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+++ b/src/3rdparty/webkit/JavaScriptCore/API/JSContextRef.cpp
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+/*
+ * Copyright (C) 2006, 2007 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 met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "JSContextRef.h"
+
+#include "APICast.h"
+#include "InitializeThreading.h"
+#include "JSCallbackObject.h"
+#include "JSClassRef.h"
+#include "JSGlobalObject.h"
+#include "JSObject.h"
+#include <wtf/Platform.h>
+
+#if PLATFORM(DARWIN)
+#include <mach-o/dyld.h>
+
+static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0
+#endif
+
+using namespace JSC;
+
+JSContextGroupRef JSContextGroupCreate()
+{
+    return toRef(JSGlobalData::create().releaseRef());
+}
+
+JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
+{
+    toJS(group)->ref();
+    return group;
+}
+
+void JSContextGroupRelease(JSContextGroupRef group)
+{
+    toJS(group)->deref();
+}
+
+JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
+{
+#if PLATFORM(DARWIN)
+    // When running on Tiger or Leopard, or if the application was linked before JSGlobalContextCreate was changed
+    // to use a unique JSGlobalData, we use a shared one for compatibility.
+#if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD)
+    if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
+#else
+    {
+#endif
+        JSLock lock(true);
+        return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass);
+    }
+#endif // PLATFORM(DARWIN)
+
+    return JSGlobalContextCreateInGroup(0, globalObjectClass);
+}
+
+JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass)
+{
+    initializeThreading();
+
+    JSLock lock(true);
+
+    RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::create();
+
+#if ENABLE(JSC_MULTIPLE_THREADS)
+    globalData->makeUsableFromMultipleThreads();
+#endif
+
+    if (!globalObjectClass) {
+        JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject;
+        return JSGlobalContextRetain(toGlobalRef(globalObject->globalExec()));
+    }
+
+    JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(globalObjectClass);
+    ExecState* exec = globalObject->globalExec();
+    JSValuePtr prototype = globalObjectClass->prototype(exec);
+    if (!prototype)
+        prototype = jsNull();
+    globalObject->resetPrototype(prototype);
+    return JSGlobalContextRetain(toGlobalRef(exec));
+}
+
+JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
+{
+    ExecState* exec = toJS(ctx);
+    JSLock lock(exec);
+
+    JSGlobalData& globalData = exec->globalData();
+
+    globalData.heap.registerThread();
+
+    gcProtect(exec->dynamicGlobalObject());
+    globalData.ref();
+    return ctx;
+}
+
+void JSGlobalContextRelease(JSGlobalContextRef ctx)
+{
+    ExecState* exec = toJS(ctx);
+    JSLock lock(exec);
+
+    gcUnprotect(exec->dynamicGlobalObject());
+
+    JSGlobalData& globalData = exec->globalData();
+    if (globalData.refCount() == 2) { // One reference is held by JSGlobalObject, another added by JSGlobalContextRetain().
+        // The last reference was released, this is our last chance to collect.
+        ASSERT(!globalData.heap.protectedObjectCount());
+        ASSERT(!globalData.heap.isBusy());
+        globalData.heap.destroy();
+    } else
+        globalData.heap.collect();
+
+    globalData.deref();
+}
+
+JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
+{
+    ExecState* exec = toJS(ctx);
+    exec->globalData().heap.registerThread();
+    JSLock lock(exec);
+
+    // It is necessary to call toThisObject to get the wrapper object when used with WebCore.
+    return toRef(exec->lexicalGlobalObject()->toThisObject(exec));
+}
+
+JSContextGroupRef JSContextGetGroup(JSContextRef ctx)
+{
+    ExecState* exec = toJS(ctx);
+    return toRef(&exec->globalData());
+}