Remove CompositorThread dependency on WebThread

content/renderer/gpu/compositor_thread.cc

Index: content/renderer/gpu/compositor_thread.cc
diff --git a/content/renderer/gpu/compositor_thread.cc b/content/renderer/gpu/compositor_thread.cc
index cde2e933d8ac22a16ab1c6cfd57d1dec98168c2d..7497b26cc65337e6c80cb8727eb9e395847b7072 100644
--- a/content/renderer/gpu/compositor_thread.cc
+++ b/content/renderer/gpu/compositor_thread.cc
@@ -100,6 +100,7 @@ void SetHighThreadPriority() {
 
 CompositorThread::CompositorThread(IPC::Listener* main_listener)
     : thread_("Compositor") {
+  thread_.Start();
   filter_ =
       new InputEventFilter(main_listener,
                            thread_.message_loop()->message_loop_proxy(),
@@ -161,6 +162,11 @@ void CompositorThread::AddInputHandlerOnCompositorThread(
           routing_id, input_handler, main_loop, render_view_impl));
 }
 
+
+base::MessageLoopProxy* CompositorThread::message_loop_proxy() const {
+  return thread_.message_loop()->message_loop_proxy();
+}
+
 void CompositorThread::RemoveInputHandler(int routing_id) {
   DCHECK_EQ(MessageLoop::current(), thread_.message_loop());