CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

cc/animation/animation_timeline.h

Index: cc/animation/animation_timeline.h
diff --git a/cc/animation/animation_timeline.h b/cc/animation/animation_timeline.h
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+++ b/cc/animation/animation_timeline.h
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+// 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_TIMELINE_H_
+#define CC_ANIMATION_ANIMATION_TIMELINE_H_
+
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "cc/base/cc_export.h"
+
+namespace cc {
+
+class AnimationPlayer;
+class LayerTreeHost;
+class LayerTreeMutatorsClient;
+
+typedef std::vector<scoped_refptr<AnimationPlayer>> AnimationPlayerList;
+
+class CC_EXPORT AnimationTimeline : public base::RefCounted<AnimationTimeline> {
+ public:
+  static scoped_refptr<AnimationTimeline> Create();
+
+  void AttachPlayer(AnimationPlayer* player);
+  void DetachPlayer(AnimationPlayer* player);
+  AnimationPlayer* GetPlayerById(int player_id) const;
+
+  LayerTreeMutatorsClient* layer_tree_mutators_client() {
+    return layer_tree_mutators_client_;
+  }
+  const LayerTreeMutatorsClient* layer_tree_mutators_client() const {
+    return layer_tree_mutators_client_;
+  }
+  void SetLayerTreeMutatorsClient(LayerTreeMutatorsClient* client);
+
+  void PushPropertiesTo(AnimationTimeline* timeline_impl);
+
+ private:
+  friend class base::RefCounted<AnimationTimeline>;
+
+  AnimationTimeline();
+  virtual ~AnimationTimeline();
+
+  void PushAttachedPlayersToImplThread(AnimationTimeline* timeline) const;
+  void RemoveDetachedPlayersFromImplThread(AnimationTimeline* timeline) const;
+  void PushPropertiesToImplThread(AnimationTimeline* timeline);
+
+  AnimationPlayerList players_;
+  LayerTreeMutatorsClient* layer_tree_mutators_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(AnimationTimeline);
+};
+
+}  // namespace cc
+
+#endif  // CC_ANIMATION_ANIMATION_TIMELINE_H_