gfx: Add FrameTime and DisplayTime classes

cc/animation/scrollbar_animation_controller_thinning.cc

Index: cc/animation/scrollbar_animation_controller_thinning.cc
diff --git a/cc/animation/scrollbar_animation_controller_thinning.cc b/cc/animation/scrollbar_animation_controller_thinning.cc
index ce196fbf955e61320af9a5669f011ced1437f185..9e99e94ed7db240090f6237cdd8146179a76b01b 100644
--- a/cc/animation/scrollbar_animation_controller_thinning.cc
+++ b/cc/animation/scrollbar_animation_controller_thinning.cc
@@ -47,13 +47,13 @@ bool ScrollbarAnimationControllerThinning::IsAnimating() const {
 }
 
 base::TimeDelta ScrollbarAnimationControllerThinning::DelayBeforeStart(
-    base::TimeTicks now) const {
+    gfx::FrameTime now) const {
   if (now > last_awaken_time_ + animation_delay_)
     return base::TimeDelta();
   return animation_delay_ - (now - last_awaken_time_);
 }
 
-bool ScrollbarAnimationControllerThinning::Animate(base::TimeTicks now) {
+bool ScrollbarAnimationControllerThinning::Animate(gfx::FrameTime now) {
   if (mouse_is_over_scrollbar_) {
     ApplyOpacityAndThumbThicknessScale(1, 1);
     return false;
@@ -64,30 +64,30 @@ bool ScrollbarAnimationControllerThinning::Animate(base::TimeTicks now) {
       progress);
   ApplyOpacityAndThumbThicknessScale(opacity, thumb_thickness_scale);
   if (progress == 1.f)
-    last_awaken_time_ = base::TimeTicks();
+    last_awaken_time_ = gfx::FrameTime();
   return IsAnimating() && DelayBeforeStart(now) == base::TimeDelta();
 }
 
 void ScrollbarAnimationControllerThinning::DidScrollGestureBegin() {
   ApplyOpacityAndThumbThicknessScale(1, 1);
-  last_awaken_time_ = base::TimeTicks();
+  last_awaken_time_ = gfx::FrameTime();
   scroll_gesture_in_progress_ = true;
 }
 
 void ScrollbarAnimationControllerThinning::DidScrollGestureEnd(
-    base::TimeTicks now) {
+    gfx::FrameTime now) {
   last_awaken_time_ = now;
   scroll_gesture_in_progress_ = false;
 }
 
 void ScrollbarAnimationControllerThinning::DidMouseMoveOffScrollbar(
-    base::TimeTicks now) {
+    gfx::FrameTime now) {
   mouse_is_over_scrollbar_ = false;
   DidScrollUpdate(now);
 }
 
 bool ScrollbarAnimationControllerThinning::DidScrollUpdate(
-    base::TimeTicks now) {
+    gfx::FrameTime now) {
   ApplyOpacityAndThumbThicknessScale(1, 1);
 
   last_awaken_time_ = now;
@@ -95,7 +95,7 @@ bool ScrollbarAnimationControllerThinning::DidScrollUpdate(
 }
 
 bool ScrollbarAnimationControllerThinning::DidMouseMoveNear(
-    base::TimeTicks now, float distance) {
+    gfx::FrameTime now, float distance) {
   if (distance == 0.0) {
     mouse_is_over_scrollbar_ = true;
     return false;
@@ -108,7 +108,7 @@ bool ScrollbarAnimationControllerThinning::DidMouseMoveNear(
 }
 
 float ScrollbarAnimationControllerThinning::AnimationProgressAtTime(
-    base::TimeTicks now) {
+    gfx::FrameTime now) {
   if (scroll_gesture_in_progress_)
     return 0;