gfx: Add FrameTime and DisplayTime classes

cc/input/top_controls_manager.cc

 // Copyright 2013 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 "cc/input/top_controls_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "cc/animation/keyframed_animation_curve.h"
@@ skipping 118 matching lines @@
   controls_top_offset = std::min(controls_top_offset, 0.f);
 
   if (controls_top_offset_ == controls_top_offset)
     return;
 
   controls_top_offset_ = controls_top_offset;
 
   client_->DidChangeTopControlsPosition();
 }
 
-gfx::Vector2dF TopControlsManager::Animate(base::TimeTicks monotonic_time) {
+gfx::Vector2dF TopControlsManager::Animate(gfx::FrameTime monotonic_time) {
   if (!top_controls_animation_ || !client_->HaveRootScrollLayer())
     return gfx::Vector2dF();
 
-  double time = (monotonic_time - base::TimeTicks()).InMillisecondsF();
+  double time = monotonic_time.Unsafe_InMillisecondsF();
 
   float old_offset = controls_top_offset_;
   SetControlsTopOffset(top_controls_animation_->GetValue(time));
 
   if (IsAnimationCompleteAtTime(monotonic_time))
     ResetAnimations();
 
   gfx::Vector2dF scroll_delta(0.f, controls_top_offset_ - old_offset);
   return scroll_delta;
 }
@@ skipping 14 matching lines @@
   if (direction == HIDING_CONTROLS &&
       controls_top_offset_ == -top_controls_height_) {
     return;
   }
 
   if (top_controls_animation_ && animation_direction_ == direction)
     return;
 
   top_controls_animation_ = KeyframedFloatAnimationCurve::Create();
   double start_time =
-      (gfx::FrameTime::Now() - base::TimeTicks()).InMillisecondsF();
+      gfx::FrameTime::Now().Unsafe_InMillisecondsF();
   top_controls_animation_->AddKeyframe(
       FloatKeyframe::Create(start_time, controls_top_offset_,
                             scoped_ptr<TimingFunction>()));
   float max_ending_offset =
       (direction == SHOWING_CONTROLS ? 1 : -1) * top_controls_height_;
   top_controls_animation_->AddKeyframe(
       FloatKeyframe::Create(start_time + kShowHideMaxDurationMs,
                             controls_top_offset_ + max_ending_offset,
                             EaseTimingFunction::Create()));
   animation_direction_ = direction;
@@ skipping 17 matching lines @@
       // down.
       show_controls = current_scroll_delta_ <= 0.f ?
           SHOWING_CONTROLS : HIDING_CONTROLS;
     }
 
     if (show_controls != NO_ANIMATION)
       SetupAnimation(show_controls);
   }
 }
 
-bool TopControlsManager::IsAnimationCompleteAtTime(base::TimeTicks time) {
+bool TopControlsManager::IsAnimationCompleteAtTime(
+    gfx::FrameTime time) {
   if (!top_controls_animation_)
     return true;
 
-  double time_ms = (time - base::TimeTicks()).InMillisecondsF();
+  double time_ms = time.Unsafe_InMillisecondsF();
   float new_offset = top_controls_animation_->GetValue(time_ms);
 
   if ((animation_direction_ == SHOWING_CONTROLS && new_offset >= 0) ||
       (animation_direction_ == HIDING_CONTROLS
           && new_offset <= -top_controls_height_)) {
     return true;
   }
   return false;
 }
 
 }  // namespace cc