gfx: Add FrameTime and DisplayTime classes

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index 9c57dc7c65044c6148bbd9b89c21f6506df46d50..1355275e57770187c570158f2ecb330d5aa33556 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -291,7 +291,7 @@ void DrawWaiterForTest::OnCompositingDidCommit(Compositor* compositor) {
 }
 
 void DrawWaiterForTest::OnCompositingStarted(Compositor* compositor,
-                                             base::TimeTicks start_time) {
+                                             gfx::FrameTime start_time) {
 }
 
 void DrawWaiterForTest::OnCompositingEnded(Compositor* compositor) {
@@ -741,7 +741,7 @@ void Compositor::DidCommit() {
 }
 
 void Compositor::DidCommitAndDrawFrame() {
-  base::TimeTicks start_time = gfx::FrameTime::Now();
+  gfx::FrameTime start_time = gfx::FrameTime::Now();
   FOR_EACH_OBSERVER(CompositorObserver,
                     observer_list_,
                     OnCompositingStarted(this, start_time));