Check target value

ui/compositor/layer_animation_element.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_LAYER_ANIMATION_ELEMENT_H_
 #define UI_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 186 matching lines @@
   // Called once each time the animation element is run before any call to
   // OnProgress.
   virtual void OnStart(LayerAnimationDelegate* delegate) = 0;
   virtual bool OnProgress(double t, LayerAnimationDelegate* delegate) = 0;
   virtual void OnGetTarget(TargetValue* target) const = 0;
   virtual void OnAbort(LayerAnimationDelegate* delegate) = 0;
 
   // Actually start the animation, dispatching to another thread if needed.
   virtual void RequestEffectiveStart(LayerAnimationDelegate* delegate);
 
+  virtual bool AreStartAndTargetSame() = 0;
+
   LayerAnimationElement(const LayerAnimationElement& element);
 
  private:
   // For debugging purposes, we sometimes alter the duration we actually use.
   // For example, during tests we often set duration = 0, and it is sometimes
   // useful to slow animations down to see them more clearly.
   base::TimeDelta GetEffectiveDuration(const base::TimeDelta& delta);
 
   bool first_frame_;
   const AnimatableProperties properties_;
@@ skipping 10 matching lines @@
   double last_progressed_fraction_;
 
   base::WeakPtrFactory<LayerAnimationElement> weak_ptr_factory_;
 
   DISALLOW_ASSIGN(LayerAnimationElement);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_