CC Animations: Port Impl-only-scrolling to use compositor animation timelines.

cc/trees/layer_tree_mutators_client.h

 // Copyright 2015 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_TREES_LAYER_TREE_MUTATORS_CLIENT_H_
 #define CC_TREES_LAYER_TREE_MUTATORS_CLIENT_H_
 
 namespace gfx {
 class Transform;
 class ScrollOffset;
@@ skipping 16 matching lines @@
   virtual void SetLayerOpacityMutated(int layer_id,
                                       bool active_tree,
                                       float opacity) = 0;
   virtual void SetLayerTransformMutated(int layer_id,
                                         bool active_tree,
                                         const gfx::Transform& transform) = 0;
   virtual void SetLayerScrollOffsetMutated(
       int layer_id,
       bool active_tree,
       const gfx::ScrollOffset& scroll_offset) = 0;
+
+  virtual void ScrollOffsetAnimationFinished() {}
+  virtual gfx::ScrollOffset GetScrollOffsetForAnimation(int layer_id) const = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_MUTATORS_CLIENT_H_