gfx: Add FrameTime and DisplayTime classes

ui/compositor/layer_animation_sequence.cc

Index: ui/compositor/layer_animation_sequence.cc
diff --git a/ui/compositor/layer_animation_sequence.cc b/ui/compositor/layer_animation_sequence.cc
index 9ebf1e0552bc596c08c5d9edcf0ada590db0a203..f2b6b01acec44818bce58ad37aec67b6593646f0 100644
--- a/ui/compositor/layer_animation_sequence.cc
+++ b/ui/compositor/layer_animation_sequence.cc
@@ -12,6 +12,7 @@
 #include "ui/compositor/layer_animation_delegate.h"
 #include "ui/compositor/layer_animation_element.h"
 #include "ui/compositor/layer_animation_observer.h"
+#include "ui/gfx/frame_time.h"
 
 namespace ui {
 
@@ -41,7 +42,7 @@ LayerAnimationSequence::~LayerAnimationSequence() {
 }
 
 void LayerAnimationSequence::Start(LayerAnimationDelegate* delegate) {
-  DCHECK(start_time_ != base::TimeTicks());
+  DCHECK(start_time_ != gfx::FrameTime());
   last_progressed_fraction_ = 0.0;
   if (elements_.empty())
     return;
@@ -50,9 +51,9 @@ void LayerAnimationSequence::Start(LayerAnimationDelegate* delegate) {
   elements_[0]->Start(delegate, animation_group_id_);
 }
 
-void LayerAnimationSequence::Progress(base::TimeTicks now,
+void LayerAnimationSequence::Progress(gfx::FrameTime now,
                                       LayerAnimationDelegate* delegate) {
-  DCHECK(start_time_ != base::TimeTicks());
+  DCHECK(start_time_ != gfx::FrameTime());
   bool redraw_required = false;
 
   if (elements_.empty())
@@ -105,7 +106,7 @@ void LayerAnimationSequence::Progress(base::TimeTicks now,
   }
 }
 
-bool LayerAnimationSequence::IsFinished(base::TimeTicks time) {
+bool LayerAnimationSequence::IsFinished(gfx::FrameTime time) {
   if (is_cyclic_ || waiting_for_group_start_)
     return false;
 
@@ -115,7 +116,7 @@ bool LayerAnimationSequence::IsFinished(base::TimeTicks time) {
   if (last_element_ == 0)
     last_start_ = start_time_;
 
-  base::TimeTicks current_start = last_start_;
+  gfx::FrameTime current_start = last_start_;
   size_t current_index = last_element_;
   base::TimeDelta element_duration;
   while (current_index < elements_.size()) {
@@ -225,8 +226,7 @@ void LayerAnimationSequence::OnThreadedAnimationStarted(
       LayerAnimationElement::ToAnimatableProperty(event.target_property);
   DCHECK(element_properties.find(event_property) != element_properties.end());
   elements_[current_index]->set_effective_start_time(
-      base::TimeTicks::FromInternalValue(
-          event.monotonic_time * base::Time::kMicrosecondsPerSecond));
+      gfx::FrameTime::Unsafe_FromSecondsF(event.monotonic_time));
 }
 
 void LayerAnimationSequence::OnScheduled() {