CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

cc/animation/element_animations.h

Index: cc/animation/element_animations.h
diff --git a/cc/animation/element_animations.h b/cc/animation/element_animations.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_ELEMENT_ANIMATIONS_H_
+#define CC_ANIMATION_ELEMENT_ANIMATIONS_H_
+
+#include "base/containers/linked_list.h"
+#include "base/memory/ref_counted.h"
+#include "cc/animation/animation_delegate.h"
+#include "cc/animation/layer_animation_controller.h"
+#include "cc/animation/layer_animation_value_provider.h"
+#include "cc/base/cc_export.h"
+
+namespace gfx {
+class ScrollOffset;
+class Transform;
+}
+
+namespace cc {
+
+class AnimationHost;
+class AnimationPlayer;
+class FilterOperations;
+class LayerAnimationController;
+enum class LayerTreeType;
+
+// An ElementAnimations owns a list of all AnimationPlayers, attached to
+// the layer. Also, it owns LayerAnimationController instance (1:1
+// relationship)
+// ElementAnimations object redirects all events from LAC to the list
+// of animation layers.
+// This is a CC counterpart for blink::ElementAnimations (in 1:1 relationship).
+// No pointer to/from respective blink::ElementAnimations object for now.
+class CC_EXPORT ElementAnimations : public AnimationDelegate,
+                                    public LayerAnimationValueProvider {
+ public:
+  static scoped_ptr<ElementAnimations> Create(AnimationHost* host);
+  ~ElementAnimations() override;
+
+  int layer_id() const {
+    return layer_animation_controller_ ? layer_animation_controller_->id() : 0;
+  }
+
+  // Parent AnimationHost.
+  AnimationHost* animation_host() { return animation_host_; }
+  const AnimationHost* animation_host() const { return animation_host_; }
+
+  LayerAnimationController* layer_animation_controller() const {
+    return layer_animation_controller_.get();
+  }
+
+  void CreateLayerAnimationController(int layer_id);
+  void DestroyLayerAnimationController();
+
+  void LayerRegistered(int layer_id, LayerTreeType tree_type);
+  void LayerUnregistered(int layer_id, LayerTreeType tree_type);
+
+  bool has_active_value_observer_for_testing() const {
+    return active_value_observer_;
+  }
+  bool has_pending_value_observer_for_testing() const {
+    return pending_value_observer_;
+  }
+
+  void AddPlayer(AnimationPlayer* player);
+  void RemovePlayer(AnimationPlayer* player);
+  bool IsEmpty() const;
+
+  typedef base::LinkedList<AnimationPlayer> PlayersList;
+  typedef base::LinkNode<AnimationPlayer> PlayersListNode;
+  const PlayersList& players_list() const { return *players_list_.get(); }
+
+  void PushPropertiesTo(ElementAnimations* element_animations_impl);
+
+ private:
+  explicit ElementAnimations(AnimationHost* host);
+
+  void SetFilterMutated(LayerTreeType tree_type,
+                        const FilterOperations& filters);
+  void SetOpacityMutated(LayerTreeType tree_type, float opacity);
+  void SetTransformMutated(LayerTreeType tree_type,
+                           const gfx::Transform& transform);
+  void SetScrollOffsetMutated(LayerTreeType tree_type,
+                              const gfx::ScrollOffset& scroll_offset);
+
+  void CreateActiveValueObserver();
+  void DestroyActiveValueObserver();
+
+  void CreatePendingValueObserver();
+  void DestroyPendingValueObserver();
+
+  // AnimationDelegate implementation
+  void NotifyAnimationStarted(base::TimeTicks monotonic_time,
+                              Animation::TargetProperty target_property,
+                              int group) override;
+  void NotifyAnimationFinished(base::TimeTicks monotonic_time,
+                               Animation::TargetProperty target_property,
+                               int group) override;
+
+  // LayerAnimationValueProvider implementation.
+  gfx::ScrollOffset ScrollOffsetForAnimation() const override;
+
+  scoped_ptr<PlayersList> players_list_;
+
+  class ValueObserver;
+  scoped_ptr<ValueObserver> active_value_observer_;
+  scoped_ptr<ValueObserver> pending_value_observer_;
+
+  // LAC is owned by ElementAnimations (1:1 relationship).
+  scoped_refptr<LayerAnimationController> layer_animation_controller_;
+  AnimationHost* animation_host_;
+
+  DISALLOW_COPY_AND_ASSIGN(ElementAnimations);
+};
+
+}  // namespace cc
+
+#endif  // CC_ANIMATION_ELEMENT_ANIMATIONS_H_