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diff --git a/WebCore/bindings/v8/V8IsolatedWorld.cpp b/WebCore/bindings/v8/V8IsolatedWorld.cpp
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+++ b/WebCore/bindings/v8/V8IsolatedWorld.cpp
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+/*
+ * Copyright (C) 2009 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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 "V8IsolatedWorld.h"
+
+#include <v8.h>
+
+#include "Frame.h"
+#include "FrameLoaderClient.h"
+#include "HashMap.h"
+#include "ScriptController.h"
+#include "V8DOMWindow.h"
+#include "V8HiddenPropertyName.h"
+
+namespace WebCore {
+
+static int isolatedWorldCount = 0;
+
+static void contextWeakReferenceCallback(v8::Persistent<v8::Value> object, void* isolated_world)
+{
+    // Our context is going away.  Time to clean up the world.
+    V8IsolatedWorld* world = static_cast<V8IsolatedWorld*>(isolated_world);
+    delete world;
+}
+
+void V8IsolatedWorld::evaluate(const Vector<ScriptSourceCode>& sources, V8Proxy* proxy, int extensionGroup)
+{
+    v8::HandleScope scope;
+    v8::Persistent<v8::Context> context = proxy->createNewContext(v8::Handle<v8::Object>(), extensionGroup);
+
+    // Run code in the new context.
+    v8::Context::Scope context_scope(context);
+
+    // The lifetime of this object is controlled by the V8 GC.
+    // We need to create the world before touching DOM wrappers.
+    V8IsolatedWorld* world = new V8IsolatedWorld(context);
+
+    V8Proxy::installHiddenObjectPrototype(context);
+    proxy->installDOMWindow(context, proxy->frame()->domWindow());
+
+    proxy->frame()->loader()->client()->didCreateIsolatedScriptContext();
+
+    for (size_t i = 0; i < sources.size(); ++i)
+        proxy->evaluate(sources[i], 0);
+
+    // Using the default security token means that the canAccess is always
+    // called, which is slow.
+    // FIXME: Use tokens where possible. This will mean keeping track of all
+    //        created contexts so that they can all be updated when the
+    //        document domain
+    //        changes.
+    // FIXME: Move this statement above proxy->evaluate?  It seems like we
+    //        should set up the token before running the script.
+    context->UseDefaultSecurityToken();
+
+    context.Dispose();
+    // WARNING!  This might well delete |world|.
+}
+
+V8IsolatedWorld::V8IsolatedWorld(v8::Handle<v8::Context> context)
+    : m_context(v8::Persistent<v8::Context>::New(context))
+{
+    ++isolatedWorldCount;
+    m_context.MakeWeak(this, &contextWeakReferenceCallback);
+    m_context->Global()->SetHiddenValue(V8HiddenPropertyName::isolatedWorld(), v8::External::Wrap(this));
+}
+
+V8IsolatedWorld::~V8IsolatedWorld()
+{
+    --isolatedWorldCount;
+    m_context.Dispose();
+    m_context.Clear();
+}
+
+V8IsolatedWorld* V8IsolatedWorld::getEntered()
+{
+    if (isolatedWorldCount == 0) {
+        // This is a temporary performance optimization.   Essentially,
+        // GetHiddenValue is too slow for this code path.  We need to get the
+        // V8 team to add a real property to v8::Context for isolated worlds.
+        // Until then, we optimize the common case of not having any isolated
+        // worlds at all.
+        return 0;
+    }
+
+    if (!v8::Context::InContext())
+        return 0;
+    v8::HandleScope scope;
+
+    v8::Local<v8::Value> world = v8::Context::GetEntered()->Global()->GetHiddenValue(V8HiddenPropertyName::isolatedWorld());
+    if (world.IsEmpty())
+        return 0;
+
+    return static_cast<V8IsolatedWorld*>(v8::External::Unwrap(world));
+}
+
+} // namespace WebCore