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_dll/ctocpp/render_process_handler_ctocpp.cc

@@ -214,6 +214,87 @@ void CefRenderProcessHandlerCToCpp::OnUncaughtException(
       CefV8StackTraceCppToC::Wrap(stackTrace));
 }
 
+void CefRenderProcessHandlerCToCpp::OnWorkerContextCreated(int worker_id,
+    const CefString& url, CefRefPtr<CefV8Context> context) {
+  if (CEF_MEMBER_MISSING(struct_, on_worker_context_created))
+    return;
+
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  // Verify param: url; type: string_byref_const
+  DCHECK(!url.empty());
+  if (url.empty())
+    return;
+  // Verify param: context; type: refptr_diff
+  DCHECK(context.get());
+  if (!context.get())
+    return;
+
+  // Execute
+  struct_->on_worker_context_created(struct_,
+      worker_id,
+      url.GetStruct(),
+      CefV8ContextCppToC::Wrap(context));
+}
+
+void CefRenderProcessHandlerCToCpp::OnWorkerContextReleased(int worker_id,
+    const CefString& url, CefRefPtr<CefV8Context> context) {
+  if (CEF_MEMBER_MISSING(struct_, on_worker_context_released))
+    return;
+
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  // Verify param: url; type: string_byref_const
+  DCHECK(!url.empty());
+  if (url.empty())
+    return;
+  // Verify param: context; type: refptr_diff
+  DCHECK(context.get());
+  if (!context.get())
+    return;
+
+  // Execute
+  struct_->on_worker_context_released(struct_,
+      worker_id,
+      url.GetStruct(),
+      CefV8ContextCppToC::Wrap(context));
+}
+
+void CefRenderProcessHandlerCToCpp::OnWorkerUncaughtException(int worker_id,
+    const CefString& url, CefRefPtr<CefV8Context> context,
+    CefRefPtr<CefV8Exception> exception,
+    CefRefPtr<CefV8StackTrace> stackTrace) {
+  if (CEF_MEMBER_MISSING(struct_, on_worker_uncaught_exception))
+    return;
+
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  // Verify param: url; type: string_byref_const
+  DCHECK(!url.empty());
+  if (url.empty())
+    return;
+  // Verify param: context; type: refptr_diff
+  DCHECK(context.get());
+  if (!context.get())
+    return;
+  // Verify param: exception; type: refptr_diff
+  DCHECK(exception.get());
+  if (!exception.get())
+    return;
+  // Verify param: stackTrace; type: refptr_diff
+  DCHECK(stackTrace.get());
+  if (!stackTrace.get())
+    return;
+
+  // Execute
+  struct_->on_worker_uncaught_exception(struct_,
+      worker_id,
+      url.GetStruct(),
+      CefV8ContextCppToC::Wrap(context),
+      CefV8ExceptionCppToC::Wrap(exception),
+      CefV8StackTraceCppToC::Wrap(stackTrace));
+}
+
 void CefRenderProcessHandlerCToCpp::OnFocusedNodeChanged(
     CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame,
     CefRefPtr<CefDOMNode> node) {