Hook up ui::Compositor to Display's BeginFrameSource

content/renderer/gpu/compositor_output_surface.cc

 // Copyright (c) 2012 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_output_surface.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 152 matching lines @@
                         OnUpdateVSyncParametersFromBrowser);
     IPC_MESSAGE_HANDLER(ViewMsg_SwapCompositorFrameAck, OnSwapAck);
     IPC_MESSAGE_HANDLER(ViewMsg_ReclaimCompositorResources, OnReclaimResources);
   IPC_END_MESSAGE_MAP()
 }
 
 void CompositorOutputSurface::OnUpdateVSyncParametersFromBrowser(
     base::TimeTicks timebase,
     base::TimeDelta interval) {
   DCHECK(client_thread_checker_.CalledOnValidThread());
-  CommitVSyncParameters(timebase, interval);
+  TRACE_EVENT2("cc",
+               "CompositorOutputSurface::OnUpdateVSyncParametersFromBrowser",
+               "timebase",
+               (timebase - base::TimeTicks()).InSecondsF(),
+               "interval",
+               interval.InSecondsF());
+  client_->CommitVSyncParameters(timebase, interval);
 }
 
 void CompositorOutputSurface::OnSwapAck(uint32_t output_surface_id,
                                         const cc::CompositorFrameAck& ack) {
   // Ignore message if it's a stale one coming from a different output surface
   // (e.g. after a lost context).
   if (output_surface_id != output_surface_id_)
     return;
   ReclaimResources(&ack);
   client_->DidSwapBuffersComplete();
 }
 
 void CompositorOutputSurface::OnReclaimResources(
     uint32_t output_surface_id,
     const cc::CompositorFrameAck& ack) {
   // Ignore message if it's a stale one coming from a different output surface
   // (e.g. after a lost context).
   if (output_surface_id != output_surface_id_)
     return;
   ReclaimResources(&ack);
 }
 
 bool CompositorOutputSurface::Send(IPC::Message* message) {
   return message_sender_->Send(message);
 }
 
 }  // namespace content