Support custom V8 bindings on WebWorker threads (issue #451).

- Add CefRenderProcessHandler callbacks for WebWorker context creation, release and uncaught exceptions.
- Add CefTaskRunner class that supports posting of tasks to standard threads and WebWorker threads.
- Organize V8 internal state information on a per-thread/per-Isolate basis.
- Add webkit_451.patch that provides the WebKit implementation.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@972 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/renderer/render_process_observer.cc

@@ -1,4 +1,4 @@
-/// Copyright (c) 2012 The Chromium Embedded Framework Authors.
+/// Copyright (c) 2013 The Chromium Embedded Framework Authors.
 // Portions (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
@@ -34,6 +34,10 @@ void CefRenderProcessObserver::WebKitInitialized() {
   CefContentRendererClient::Get()->WebKitInitialized();
 }
 
+void CefRenderProcessObserver::OnRenderProcessShutdown() {
+  CefContentRendererClient::Get()->OnRenderProcessShutdown();
+}
+
 void CefRenderProcessObserver::OnModifyCrossOriginWhitelistEntry(
     bool add,
     const Cef_CrossOriginWhiteListEntry_Params& params) {