gfx: Add FrameTime and DisplayTime classes

ui/gfx/animation/animation_container.h

Index: ui/gfx/animation/animation_container.h
diff --git a/ui/gfx/animation/animation_container.h b/ui/gfx/animation/animation_container.h
index bb59f8f0cc75451659baaa18fe5b8edf23679bdd..229046836485858b819a560987efd26fcb7e27e2 100644
--- a/ui/gfx/animation/animation_container.h
+++ b/ui/gfx/animation/animation_container.h
@@ -11,6 +11,7 @@
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "ui/gfx/gfx_export.h"
+#include "ui/gfx/frame_time.h"
 
 namespace gfx {
 
@@ -46,7 +47,7 @@ class GFX_EXPORT AnimationContainer
   }
 
   // The time the last animation ran at.
-  base::TimeTicks last_tick_time() const { return last_tick_time_; }
+  gfx::FrameTime last_tick_time() const { return last_tick_time_; }
 
   // Are there any timers running?
   bool is_running() const { return !elements_.empty(); }
@@ -71,7 +72,7 @@ class GFX_EXPORT AnimationContainer
   // . If only a single animation has been started and the timer hasn't yet
   //   fired this is the time the animation was added.
   // . The time the last animation ran at (::Run was invoked).
-  base::TimeTicks last_tick_time_;
+  gfx::FrameTime last_tick_time_;
 
   // Set of elements (animations) being managed.
   Elements elements_;