gfx: Add FrameTime and DisplayTime classes

cc/trees/single_thread_proxy.h

Index: cc/trees/single_thread_proxy.h
diff --git a/cc/trees/single_thread_proxy.h b/cc/trees/single_thread_proxy.h
index 14960b7416f3aee41b425f1faa960b2c61a8557d..ce33114b1fe7a32ad1e01fcaa72d961dac412404 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -75,20 +75,19 @@ class SingleThreadProxy : public Proxy, LayerTreeHostImplClient {
   virtual void DidActivatePendingTree() OVERRIDE {}
 
   // Called by the legacy path where RenderWidget does the scheduling.
-  void CompositeImmediately(base::TimeTicks frame_begin_time);
+  void CompositeImmediately(gfx::FrameTime frame_begin_time);
 
  private:
   explicit SingleThreadProxy(LayerTreeHost* layer_tree_host);
 
   void OnOutputSurfaceInitializeAttempted(bool success);
-  bool CommitAndComposite(base::TimeTicks frame_begin_time,
+  bool CommitAndComposite(gfx::FrameTime frame_begin_time,
                           gfx::Rect device_viewport_damage_rect,
                           bool for_readback,
                           LayerTreeHostImpl::FrameData* frame);
   void DoCommit(scoped_ptr<ResourceUpdateQueue> queue);
-  bool DoComposite(
-      scoped_refptr<cc::ContextProvider> offscreen_context_provider,
-      base::TimeTicks frame_begin_time,
+  bool DoComposite(scoped_refptr<cc::ContextProvider> offscreen_context_provider,
+      gfx::FrameTime frame_begin_time,
       gfx::Rect device_viewport_damage_rect,
       bool for_readback,
       LayerTreeHostImpl::FrameData* frame);