cc: Disallow scroll offset animations when impl-scrolling isn't supported

cc/animation/animation_registrar.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_ANIMATION_REGISTRAR_H_
 #define CC_ANIMATION_ANIMATION_REGISTRAR_H_
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 33 matching lines @@
   void UnregisterAnimationController(LayerAnimationController* controller);
 
   const AnimationControllerMap& active_animation_controllers() const {
     return active_animation_controllers_;
   }
 
   const AnimationControllerMap& all_animation_controllers() const {
     return all_animation_controllers_;
   }
 
+  void set_supports_scroll_animations(bool supports_scroll_animations) {
+    supports_scroll_animations_ = supports_scroll_animations;
+  }
+
+  bool supports_scroll_animations() { return supports_scroll_animations_; }
+
  private:
   AnimationRegistrar();
 
   AnimationControllerMap active_animation_controllers_;
   AnimationControllerMap all_animation_controllers_;
 
+  bool supports_scroll_animations_;
+
   DISALLOW_COPY_AND_ASSIGN(AnimationRegistrar);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_REGISTRAR_H_