gfx: Add FrameTime and DisplayTime classes

ui/gfx/animation/linear_animation.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/animation/linear_animation.h"
 
 #include <math.h>
 
 #include "ui/gfx/animation/animation_container.h"
 #include "ui/gfx/animation/animation_delegate.h"
@@ skipping 53 matching lines @@
 }
 
 void LinearAnimation::SetDuration(int duration) {
   duration_ = TimeDelta::FromMilliseconds(duration);
   if (duration_ < timer_interval())
     duration_ = timer_interval();
   if (is_animating())
     SetStartTime(container()->last_tick_time());
 }
 
-void LinearAnimation::Step(base::TimeTicks time_now) {
+void LinearAnimation::Step(gfx::FrameTime time_now) {
   TimeDelta elapsed_time = time_now - start_time();
   state_ = static_cast<double>(elapsed_time.InMicroseconds()) /
            static_cast<double>(duration_.InMicroseconds());
   if (state_ >= 1.0)
     state_ = 1.0;
 
   AnimateToState(state_);
 
   if (delegate())
     delegate()->AnimationProgressed(this);
@@ skipping 14 matching lines @@
   // Set state_ to ensure we send ended to delegate and not canceled.
   state_ = 1;
   AnimateToState(1.0);
 }
 
 bool LinearAnimation::ShouldSendCanceledFromStop() {
   return state_ != 1;
 }
 
 }  // namespace gfx