gfx: Add FrameTime and DisplayTime classes

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 90c8c258e8b01a84888a61712f934654934c4979..fe4c363c15baf2957ed8e4fb10bb31f31c4a2ce8 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -145,8 +145,8 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
   // LayerTreeHost interface to Proxy.
   void WillBeginMainFrame() { client_->WillBeginMainFrame(); }
   void DidBeginMainFrame();
-  void UpdateClientAnimations(base::TimeTicks monotonic_frame_begin_time);
-  void AnimateLayers(base::TimeTicks monotonic_frame_begin_time);
+  void UpdateClientAnimations(gfx::FrameTime monotonic_frame_begin_time);
+  void AnimateLayers(gfx::FrameTime monotonic_frame_begin_time);
   void DidStopFlinging();
   void Layout();
   void BeginCommitOnImplThread(LayerTreeHostImpl* host_impl);
@@ -179,7 +179,7 @@ class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
 
   void NotifyInputThrottledUntilCommit();
 
-  void Composite(base::TimeTicks frame_begin_time);
+  void Composite(gfx::FrameTime frame_begin_time);
 
   // Only used when compositing on the main thread.
   void ScheduleComposite();