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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+// 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/containers/hash_tables.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "cc/base/cc_export.h"
+
+namespace cc {
+
+class AnimationHost;
+class AnimationPlayer;
+
+typedef std::vector<scoped_refptr<AnimationPlayer>> AnimationPlayerList;
+
+// An AnimationTimeline owns a group of AnimationPlayers.
+// This is a cc counterpart for blink::AnimationTimeline (in 1:1 relationship).
+// Each AnimationTimeline and its AnimationPlayers have their copies on
+// the impl thread. We synchronize main thread and impl thread instances
+// using integer IDs.
+class CC_EXPORT AnimationTimeline : public base::RefCounted<AnimationTimeline> {
+ public:
+  static scoped_refptr<AnimationTimeline> Create(int id);
+  scoped_refptr<AnimationTimeline> CreateImplInstance() const;
+
+  int id() const { return id_; }
+
+  // Parent AnimationHost.
+  AnimationHost* animation_host() { return animation_host_; }
+  const AnimationHost* animation_host() const { return animation_host_; }
+  void SetAnimationHost(AnimationHost* animation_host);
+
+  void set_is_impl_only(bool is_impl_only) { is_impl_only_ = is_impl_only; }
+  bool is_impl_only() const { return is_impl_only_; }
+
+  void AttachPlayer(scoped_refptr<AnimationPlayer> player);
+  void DetachPlayer(scoped_refptr<AnimationPlayer> player);
+
+  void ClearPlayers();
+
+  void PushPropertiesTo(AnimationTimeline* timeline_impl);
+
+  AnimationPlayer* GetPlayerById(int player_id) const;
+
+ private:
+  friend class base::RefCounted<AnimationTimeline>;
+
+  explicit AnimationTimeline(int id);
+  virtual ~AnimationTimeline();
+
+  void PushAttachedPlayersToImplThread(AnimationTimeline* timeline) const;
+  void RemoveDetachedPlayersFromImplThread(AnimationTimeline* timeline) const;
+  void PushPropertiesToImplThread(AnimationTimeline* timeline);
+
+  void ErasePlayers(AnimationPlayerList::iterator begin,
+                    AnimationPlayerList::iterator end);
+
+  AnimationPlayerList players_;
+  int id_;
+  AnimationHost* animation_host_;
+
+  // Impl-only AnimationTimeline has no main thread instance and lives on
+  // it's own.
+  bool is_impl_only_;
+
+  DISALLOW_COPY_AND_ASSIGN(AnimationTimeline);
+};
+
+}  // namespace cc
+
+#endif  // CC_ANIMATION_ANIMATION_TIMELINE_H_