Animation start scale should be considered for the raster scale

cc/animation/keyframed_animation_curve.h

 // Copyright 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 CC_ANIMATION_KEYFRAMED_ANIMATION_CURVE_H_
 #define CC_ANIMATION_KEYFRAMED_ANIMATION_CURVE_H_
 
 #include "base/time/time.h"
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/timing_function.h"
@@ skipping 178 matching lines @@
   base::TimeDelta Duration() const override;
   scoped_ptr<AnimationCurve> Clone() const override;
 
   // TransformAnimationCurve implementation
   gfx::Transform GetValue(base::TimeDelta t) const override;
   bool AnimatedBoundsForBox(const gfx::BoxF& box,
                             gfx::BoxF* bounds) const override;
   bool AffectsScale() const override;
   bool PreservesAxisAlignment() const override;
   bool IsTranslation() const override;
+  bool AnimationStartScale(bool forward_direction,
+                           float* start_scale) const override;
   bool MaximumTargetScale(bool forward_direction,
                           float* max_scale) const override;
 
  private:
   KeyframedTransformAnimationCurve();
 
   // Always sorted in order of increasing time. No two keyframes have the
   // same time.
   ScopedPtrVector<TransformKeyframe> keyframes_;
   scoped_ptr<TimingFunction> timing_function_;
@@ skipping 29 matching lines @@
   // same time.
   ScopedPtrVector<FilterKeyframe> keyframes_;
   scoped_ptr<TimingFunction> timing_function_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyframedFilterAnimationCurve);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_KEYFRAMED_ANIMATION_CURVE_H_