Make Keyframe use TimeTicks/TimeDelta to represent time instead of double.

ui/compositor/float_animation_curve_adapter.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_COMPOSITOR_FLOAT_ANIMATION_CURVE_ADAPTER_H_
 #define UI_COMPOSITOR_FLOAT_ANIMATION_CURVE_ADAPTER_H_
 
 #include "base/time/time.h"
 #include "cc/animation/animation_curve.h"
 #include "ui/gfx/animation/tween.h"
 
 namespace ui {
 
 class FloatAnimationCurveAdapter : public cc::FloatAnimationCurve {
  public:
   FloatAnimationCurveAdapter(gfx::Tween::Type tween_type,
                              float initial_value,
                              float target_value,
                              base::TimeDelta duration);
 
   ~FloatAnimationCurveAdapter() override {}
 
   // FloatAnimationCurve implementation.
   base::TimeDelta Duration() const override;
   scoped_ptr<cc::AnimationCurve> Clone() const override;
-  float GetValue(double t) const override;
+  float GetValue(base::TimeDelta t) const override;
 
  private:
   gfx::Tween::Type tween_type_;
   float initial_value_;
   float target_value_;
   base::TimeDelta duration_;
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_FLOAT_ANIMATION_CURVE_ADAPTER_H_