gfx: Add FrameTime and DisplayTime classes

cc/output/output_surface.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_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
@@ skipping 172 matching lines @@
   void OnSwapBuffersComplete();
   void ReclaimResources(const CompositorFrameAck* ack);
   void DidLoseOutputSurface();
   void SetExternalStencilTest(bool enabled);
   void SetExternalDrawConstraints(const gfx::Transform& transform,
                                   gfx::Rect viewport,
                                   gfx::Rect clip,
                                   bool valid_for_tile_management);
 
   // virtual for testing.
-  virtual base::TimeTicks RetroactiveBeginImplFrameDeadline();
+  virtual gfx::FrameTime RetroactiveBeginImplFrameDeadline();
   virtual void PostCheckForRetroactiveBeginImplFrame();
   void CheckForRetroactiveBeginImplFrame();
 
  private:
   OutputSurfaceClient* client_;
   friend class OutputSurfaceCallbacks;
 
   void SetUpContext3d();
   void ResetContext3d();
   void SetMemoryPolicy(const ManagedMemoryPolicy& policy,
@@ skipping 11 matching lines @@
   std::deque<unsigned> available_gpu_latency_query_ids_;
   std::deque<unsigned> pending_gpu_latency_query_ids_;
   RollingTimeDeltaHistory gpu_latency_history_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_H_