cc: Emulate BeginFrame in OutputSurfaces that don't support it natively

cc/output/output_surface_client.h

 // Copyright 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.
 
 #ifndef CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/context_provider.h"
 #include "ui/gfx/rect.h"
 
 namespace gfx {
 class Transform;
 }
 
 namespace cc {
 
 class CompositorFrameAck;
 
 class CC_EXPORT OutputSurfaceClient {
  public:
   // Called to synchronously re-initialize using the Context3D. Upon returning
   // the compositor should be able to draw using GL what was previously
   // committed.
   virtual bool DeferredInitialize(
       scoped_refptr<ContextProvider> offscreen_context_provider) = 0;
   virtual void SetNeedsRedrawRect(gfx::Rect damage_rect) = 0;
-  virtual void OnVSyncParametersChanged(base::TimeTicks timebase,
-                                        base::TimeDelta interval) = 0;
   virtual void BeginFrame(base::TimeTicks frame_time) = 0;
   virtual void OnSwapBuffersComplete(const CompositorFrameAck* ack) = 0;
   virtual void DidLoseOutputSurface() = 0;
   virtual void SetExternalDrawConstraints(const gfx::Transform& transform,
                                           gfx::Rect viewport) = 0;
 
  protected:
   virtual ~OutputSurfaceClient() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_