Support distributing vsync info with surfaces.

content/browser/compositor/onscreen_display_client.h

 // 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.
 
 #ifndef CONTENT_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_
 #define CONTENT_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_
 
 #include "cc/surfaces/display_client.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "cc/surfaces/display.h"
 
 namespace cc {
 class ContextProvider;
 class SurfaceManager;
 }
 
 namespace content {
+class SurfaceDisplayOutputSurface;
 
 // This class provides a DisplayClient implementation for drawing directly to an
 // onscreen context.
 class OnscreenDisplayClient : cc::DisplayClient {
  public:
   OnscreenDisplayClient(
       scoped_ptr<cc::OutputSurface> output_surface,
       cc::SurfaceManager* manager,
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   virtual ~OnscreenDisplayClient();
 
   cc::Display* display() { return display_.get(); }
+  void set_surface_output_surface(SurfaceDisplayOutputSurface* surface) {

[jamesr, 2014/09/17 05:47:11]

there's a tongue twister

+    surface_display_output_surface_ = surface;
+  }
 
   // cc::DisplayClient implementation.
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface() OVERRIDE;
   virtual void DisplayDamaged() OVERRIDE;
+  virtual void CommitVSyncParameters(base::TimeTicks timebase,
+                                     base::TimeDelta interval) OVERRIDE;
 
  private:
   void Draw();
 
   scoped_ptr<cc::OutputSurface> output_surface_;
   scoped_ptr<cc::Display> display_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  SurfaceDisplayOutputSurface* surface_display_output_surface_;
   bool scheduled_draw_;
 
   base::WeakPtrFactory<OnscreenDisplayClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OnscreenDisplayClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_