Read compositor VSync information from platform, when possible

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 "base/command_line.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 120 matching lines @@
   }
 
   OutputSurface::SwapBuffers(frame);
 }
 
 void CompositorOutputSurface::OnMessageReceived(const IPC::Message& message) {
   DCHECK(CalledOnValidThread());
   if (!HasClient())
     return;
   IPC_BEGIN_MESSAGE_MAP(CompositorOutputSurface, message)
-    IPC_MESSAGE_HANDLER(ViewMsg_UpdateVSyncParameters, OnUpdateVSyncParameters);
+    IPC_MESSAGE_HANDLER(ViewMsg_UpdateVSyncParameters,
+                        OnUpdateVSyncParametersFromBrowser);
     IPC_MESSAGE_HANDLER(ViewMsg_SwapCompositorFrameAck, OnSwapAck);
     IPC_MESSAGE_HANDLER(ViewMsg_ReclaimCompositorResources, OnReclaimResources);
 #if defined(OS_ANDROID)
     IPC_MESSAGE_HANDLER(ViewMsg_BeginFrame, OnBeginImplFrame);
 #endif
   IPC_END_MESSAGE_MAP()
 }
 
-void CompositorOutputSurface::OnUpdateVSyncParameters(
-    base::TimeTicks timebase, base::TimeDelta interval) {
+void CompositorOutputSurface::OnUpdateVSyncParametersFromBrowser(
+    base::TimeTicks timebase,
+    base::TimeDelta interval) {
   DCHECK(CalledOnValidThread());
-  OnVSyncParametersChanged(timebase, interval);
+  CommitVSyncParameters(timebase, interval);
 }
 
 #if defined(OS_ANDROID)
 void CompositorOutputSurface::SetNeedsBeginImplFrame(bool enable) {
   DCHECK(CalledOnValidThread());
   if (needs_begin_impl_frame_ != enable)
     Send(new ViewHostMsg_SetNeedsBeginFrame(routing_id_, enable));
   OutputSurface::SetNeedsBeginImplFrame(enable);
 }
 
@@ skipping 62 matching lines @@
   // If this is the last surface to stop preferring smoothness,
   // Reset the main thread's priority to the default.
   if (prefers_smoothness_ == true &&
       --g_prefer_smoothness_count == 0) {
     SetThreadPriorityToDefault(main_thread_handle_);
   }
   prefers_smoothness_ = prefers_smoothness;
 }
 
 }  // namespace content