Add support for bounds animations

cc/animation/element_animations.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_ANIMATION_ELEMENT_ANIMATIONS_H_
 #define CC_ANIMATION_ELEMENT_ANIMATIONS_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "cc/animation/animation_export.h"
 #include "cc/trees/element_id.h"
 #include "cc/trees/property_animation_state.h"
 #include "cc/trees/target_property.h"
 #include "ui/gfx/geometry/scroll_offset.h"
 #include "ui/gfx/transform.h"
 
 namespace gfx {
 class BoxF;
+class SizeF;
 }
 
 namespace cc {
 
 class AnimationHost;
 class AnimationPlayer;
 class FilterOperations;
 enum class ElementListType;
 struct AnimationEvent;
 
@@ skipping 117 matching lines @@
                                    bool notify_pending_elements);
   void NotifyClientTransformAnimated(const gfx::Transform& transform,
                                      bool notify_active_elements,
                                      bool notify_pending_elements);
   void NotifyClientFilterAnimated(const FilterOperations& filter,
                                   bool notify_active_elements,
                                   bool notify_pending_elements);
   void NotifyClientScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset,
                                         bool notify_active_elements,
                                         bool notify_pending_elements);
+  void NotifyClientBoundsAnimated(const gfx::SizeF& size,
+                                  bool notify_active_elements,
+                                  bool notify_pending_elements);
+
   gfx::ScrollOffset ScrollOffsetForAnimation() const;
 
  private:
   friend class base::RefCounted<ElementAnimations>;
 
   ElementAnimations();
   ~ElementAnimations();
 
   void OnFilterAnimated(ElementListType list_type,
                         const FilterOperations& filters);
@@ skipping 21 matching lines @@
   PropertyAnimationState pending_state_;
 
   mutable bool needs_update_impl_client_state_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementAnimations);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ELEMENT_ANIMATIONS_H_