Use the scheduler to drive the Sky compositor

sky/compositor/layer_host_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 SKY_COMPOSITOR_LAYER_HOST_CLIENT_H_
 #define SKY_COMPOSITOR_LAYER_HOST_CLIENT_H_
 
+#include "base/time/time.h"
 #include "mojo/services/public/interfaces/surfaces/surface_id.mojom.h"
 
 namespace mojo {
 class Shell;
 }
 
 namespace sky {
 
 class LayerHostClient {
  public:
   virtual mojo::Shell* GetShell() = 0;
-  virtual void BeginFrame() = 0;
+  virtual void BeginFrame(base::TimeTicks frame_time) = 0;
   virtual void OnSurfaceIdAvailable(mojo::SurfaceIdPtr surface_id) = 0;
 
  protected:
   virtual ~LayerHostClient();
 };
 
 }  // namespace sky
 
 #endif  // SKY_COMPOSITOR_LAYER_HOST_CLIENT_H_