gfx: Add FrameTime and DisplayTime classes

ash/wm/window_animations.cc

Index: ash/wm/window_animations.cc
diff --git a/ash/wm/window_animations.cc b/ash/wm/window_animations.cc
index ffbe00789a66fbcbac40c1c0f6aacbaf2c307ad5..fe32bece843bddfb9b7903a3001de7365a6644b8 100644
--- a/ash/wm/window_animations.cc
+++ b/ash/wm/window_animations.cc
@@ -32,6 +32,7 @@
 #include "ui/compositor/layer_animation_sequence.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
+#include "ui/gfx/frame_time.h"
 #include "ui/gfx/interpolated_transform.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/vector3d_f.h"
@@ -274,7 +275,7 @@ class CrossFadeObserver : public ui::CompositorObserver,
   virtual void OnCompositingDidCommit(ui::Compositor* compositor) OVERRIDE {
   }
   virtual void OnCompositingStarted(ui::Compositor* compositor,
-                                    base::TimeTicks start_time) OVERRIDE {
+                                    gfx::FrameTime start_time) OVERRIDE {
   }
   virtual void OnCompositingEnded(ui::Compositor* compositor) OVERRIDE {
   }
@@ -286,7 +287,7 @@ class CrossFadeObserver : public ui::CompositorObserver,
       ui::Compositor* compositor) OVERRIDE {
   }
   virtual void OnUpdateVSyncParameters(ui::Compositor* compositor,
-                                       base::TimeTicks timebase,
+                                       gfx::FrameTime timebase,
                                        base::TimeDelta interval) OVERRIDE {
   }