Send vsync timebase updates to the browser compositor

cc/renderer.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 CCRenderer_h
 #define CCRenderer_h
 
 #include "base/basictypes.h"
 #include "CCLayerTreeHost.h"
 #include "CCRenderPass.h"
 #include "FloatQuad.h"
 #include "IntRect.h"
 
 namespace cc {
 
 class CCScopedTexture;
 
 class CCRendererClient {
 public:
     virtual const IntSize& deviceViewportSize() const = 0;
     virtual const CCLayerTreeSettings& settings() const = 0;
     virtual void didLoseContext() = 0;
     virtual void onSwapBuffersComplete() = 0;
+    virtual void onUpdateVSyncTime(int64 time) = 0;
     virtual void releaseContentsTextures() = 0;
     virtual void setFullRootLayerDamage() = 0;
     virtual void setMemoryAllocationLimitBytes(size_t) = 0;
 protected:
     virtual ~CCRendererClient() { }
 };
 
 class CCRenderer {
 public:
     // This enum defines the various resource pools for the CCResourceProvider
@@ skipping 40 matching lines @@
     }
 
     CCRendererClient* m_client;
 
     DISALLOW_COPY_AND_ASSIGN(CCRenderer);
 };
 
 }
 
 #endif // CCRenderer_h