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

cc/animation/animation_host.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_ANIMATION_HOST_H_
 #define CC_ANIMATION_ANIMATION_HOST_H_
 
 #include <vector>
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "cc/animation/animation_events.h"
 #include "cc/base/cc_export.h"
 
+namespace gfx {
+class ScrollOffset;
+}
+
 namespace cc {
 
 class AnimationPlayer;
 class AnimationRegistrar;
 class AnimationTimeline;
 class LayerTreeHost;
 class LayerTreeMutatorsClient;
 
 typedef std::vector<scoped_refptr<AnimationTimeline>> AnimationTimelineList;
 
@@ skipping 62 matching lines @@
                                       const gfx::BoxF& box,
                                       gfx::BoxF* bounds) const;
 
   bool HasOnlyTranslationTransforms(int layer_id) const;
   bool AnimationsPreserveAxisAlignment(int layer_id) const;
   bool MaximumTargetScale(int layer_id, float* max_scale) const;
 
   bool HasAnyAnimation(int layer_id) const;
   bool HasActiveAnimation(int layer_id) const;
 
+  void ImplOnlyScrollAnimationCreate(int layer_id,
+                                     const gfx::ScrollOffset& target_offset,
+                                     const gfx::ScrollOffset& current_offset);
+  bool ImplOnlyScrollAnimationUpdateTarget(
+      int layer_id,
+      const gfx::Vector2dF& scroll_delta,
+      const gfx::ScrollOffset& max_scroll_offset,
+      base::TimeTicks frame_monotonic_time);
+
  private:
+  class ScrollOffsetAnimations;
+
   // TODO(loyso): Temporary 1:1 mapping. AnimationPlayers share
   // LayerAnimationController for a given layer at the moment.
   // Introduce LayersAnimations for the many AnimationPlayers to many Layers
   // mapping (a CC counterpart for blink::ElementAnimations).
   typedef base::hash_map<int, AnimationPlayer*> LayerToPlayerMap;
   LayerToPlayerMap layer_to_player_map_;
 
   explicit AnimationHost(bool is_impl_instance);
 
   void PushTimelinesToImplThread(AnimationHost* host_impl) const;
   void RemoveTimelinesFromImplThread(AnimationHost* host_impl) const;
   void PushPropertiesToImplThread(AnimationHost* host_impl);
 
   void EraseTimelines(AnimationTimelineList::iterator begin,
                       AnimationTimelineList::iterator end);
 
   AnimationTimelineList timelines_;
   scoped_ptr<AnimationRegistrar> animation_registrar_;
   LayerTreeMutatorsClient* layer_tree_mutators_client_;
 
+  scoped_ptr<ScrollOffsetAnimations> scroll_offset_animations_;
+
   const bool is_impl_instance_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimationHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_HOST_H_