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/v8context_ctocpp.cc

@@ -12,6 +12,7 @@
 
 #include "libcef_dll/ctocpp/browser_ctocpp.h"
 #include "libcef_dll/ctocpp/frame_ctocpp.h"
+#include "libcef_dll/ctocpp/task_runner_ctocpp.h"
 #include "libcef_dll/ctocpp/v8context_ctocpp.h"
 #include "libcef_dll/ctocpp/v8exception_ctocpp.h"
 #include "libcef_dll/ctocpp/v8value_ctocpp.h"
@@ -52,6 +53,19 @@ bool CefV8Context::InContext() {
 
 // VIRTUAL METHODS - Body may be edited by hand.
 
+CefRefPtr<CefTaskRunner> CefV8ContextCToCpp::GetTaskRunner() {
+  if (CEF_MEMBER_MISSING(struct_, get_task_runner))
+    return NULL;
+
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  // Execute
+  cef_task_runner_t* _retval = struct_->get_task_runner(struct_);
+
+  // Return type: refptr_same
+  return CefTaskRunnerCToCpp::Wrap(_retval);
+}
+
 bool CefV8ContextCToCpp::IsValid() {
   if (CEF_MEMBER_MISSING(struct_, is_valid))
     return false;