Make disable vsync run the renderer independently

content/renderer/gpu/compositor_external_begin_frame_source.cc

 // Copyright 2014 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.
 
 #include "content/renderer/gpu/compositor_external_begin_frame_source.h"
 
 #include "content/common/view_messages.h"
 #include "ipc/ipc_sync_channel.h"
 #include "ipc/ipc_sync_message_filter.h"
 
@@ skipping 37 matching lines @@
   }
 
   external_begin_frame_source_.AddObserver(obs);
 }
 
 void CompositorExternalBeginFrameSource::RemoveObserver(
     cc::BeginFrameObserver* obs) {
   external_begin_frame_source_.RemoveObserver(obs);
 }
 
+bool CompositorExternalBeginFrameSource::IsThrottled() const {
+  return true;
+}
+
 void CompositorExternalBeginFrameSource::OnNeedsBeginFrames(
     bool needs_begin_frames) {
   Send(new ViewHostMsg_SetNeedsBeginFrames(routing_id_, needs_begin_frames));
 }
 
 void CompositorExternalBeginFrameSource::OnMessageReceived(
     const IPC::Message& message) {
   DCHECK(CalledOnValidThread());
   DCHECK(begin_frame_source_proxy_);
   IPC_BEGIN_MESSAGE_MAP(CompositorExternalBeginFrameSource, message)
@@ skipping 11 matching lines @@
 void CompositorExternalBeginFrameSource::OnBeginFrame(
     const cc::BeginFrameArgs& args) {
   external_begin_frame_source_.OnBeginFrame(args);
 }
 
 bool CompositorExternalBeginFrameSource::Send(IPC::Message* message) {
   return message_sender_->Send(message);
 }
 
 }  // namespace content