CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index bd53413faf9676bc158b369e10651f5ebd232aab..23aa6a394333fc81558b2e1f48095ad1443e00f5 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -36,6 +36,7 @@
 #include "cc/surfaces/surface_sequence.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_common.h"
+#include "cc/trees/layer_tree_mutators_client.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "cc/trees/proxy.h"
 #include "cc/trees/swap_promise_monitor.h"
@@ -48,6 +49,7 @@ class GpuMemoryBufferManager;
 
 namespace cc {
 class AnimationRegistrar;
+class AnimationHost;
 class BeginFrameSource;
 class HeadsUpDisplayLayer;
 class Layer;
@@ -70,7 +72,7 @@ struct RenderingStats;
 struct ScrollAndScaleSet;
 enum class GpuRasterizationStatus;
 
-class CC_EXPORT LayerTreeHost {
+class CC_EXPORT LayerTreeHost : public LayerTreeMutatorsClient {
  public:
   // The SharedBitmapManager will be used on the compositor thread.
   static scoped_ptr<LayerTreeHost> CreateThreaded(
@@ -257,6 +259,7 @@ class CC_EXPORT LayerTreeHost {
   AnimationRegistrar* animation_registrar() const {
     return animation_registrar_.get();
   }
+  AnimationHost* animation_host() const { return animation_host_.get(); }
 
   bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
 
@@ -310,6 +313,27 @@ class CC_EXPORT LayerTreeHost {
 
   PropertyTrees* property_trees() { return &property_trees_; }
 
+  Layer* LayerById(int id) const;
+  void RegisterLayer(Layer* layer);
+  void UnregisterLayer(Layer* layer);
+  // LayerTreeMutatorsClient implementation.
+  bool IsLayerInActiveTree(int layer_id) const override;
+  bool IsLayerInPendingTree(int layer_id) const override;
+  void SetMutatorsNeedCommit() override;
+  void SetLayerFilterMutated(int layer_id,
+                             bool active_tree,
+                             const FilterOperations& filters) override;
+  void SetLayerOpacityMutated(int layer_id,
+                              bool active_tree,
+                              float opacity) override;
+  void SetLayerTransformMutated(int layer_id,
+                                bool active_tree,
+                                const gfx::Transform& transform) override;
+  void SetLayerScrollOffsetMutated(
+      int layer_id,
+      bool active_tree,
+      const gfx::ScrollOffset& scroll_offset) override;
+
  protected:
   LayerTreeHost(LayerTreeHostClient* client,
                 SharedBitmapManager* shared_bitmap_manager,
@@ -426,6 +450,7 @@ class CC_EXPORT LayerTreeHost {
   size_t partial_texture_update_requests_;
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;
+  scoped_ptr<AnimationHost> animation_host_;
 
   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
@@ -454,6 +479,9 @@ class CC_EXPORT LayerTreeHost {
 
   PropertyTrees property_trees_;
 
+  typedef base::hash_map<int, Layer*> LayerIdMap;
+  LayerIdMap layer_id_map_;
+
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;