gfx: Add FrameTime and DisplayTime classes

ui/gfx/animation/multi_animation.cc

Index: ui/gfx/animation/multi_animation.cc
diff --git a/ui/gfx/animation/multi_animation.cc b/ui/gfx/animation/multi_animation.cc
index 4ecc73c805a7059a189ddba4840393c9720c2a4c..67ae24c36b06560e53d91d46725ac3e4b3f0bcaa 100644
--- a/ui/gfx/animation/multi_animation.cc
+++ b/ui/gfx/animation/multi_animation.cc
@@ -43,7 +43,7 @@ double MultiAnimation::GetCurrentValue() const {
   return current_value_;
 }
 
-void MultiAnimation::Step(base::TimeTicks time_now) {
+void MultiAnimation::Step(gfx::FrameTime time_now) {
   double last_value = current_value_;
   size_t last_index = current_part_index_;
 
@@ -67,7 +67,7 @@ void MultiAnimation::Step(base::TimeTicks time_now) {
   }
 }
 
-void MultiAnimation::SetStartTime(base::TimeTicks start_time) {
+void MultiAnimation::SetStartTime(gfx::FrameTime start_time) {
   Animation::SetStartTime(start_time);
   current_value_ = 0;
   current_part_index_ = 0;