compositor-worker: blink->cc plumbing

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 7dfaa162e192fe5fed23b49aa1f347b1c90b0c44..4a9c36a18303fdf1f21457413fe10aa8dbd1730c 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -16,6 +16,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "cc/animation/animation_registrar.h"
+#include "cc/animation/layer_tree_mutator.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/synced_property.h"
@@ -144,6 +145,7 @@ class CC_EXPORT LayerTreeHostImpl
       public TopControlsManagerClient,
       public ScrollbarAnimationControllerClient,
       public VideoFrameControllerClient,
+      public LayerTreeMutatorClient,
       public MutatorHostClient,
       public base::SupportsWeakPtr<LayerTreeHostImpl> {
  public:
@@ -231,6 +233,7 @@ class CC_EXPORT LayerTreeHostImpl
   virtual void BeginCommit();
   virtual void CommitComplete();
   virtual void UpdateAnimationState(bool start_ready_animations);
+  bool Mutate(base::TimeTicks monotinic_time);
   void ActivateAnimations();
   void Animate();
   void AnimatePendingTreeAfterCommit();
@@ -362,6 +365,9 @@ class CC_EXPORT LayerTreeHostImpl
               const gfx::Rect& clip,
               bool resourceless_software_draw) override;
 
+  // LayerTreeMutatorClient.
+  void SetNeedsMutate() override;
+
   // Called from LayerTreeImpl.
   void OnCanDrawStateChangedForTree();
 
@@ -595,6 +601,9 @@ class CC_EXPORT LayerTreeHostImpl
       scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
       scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events);
 
+  void SetLayerTreeMutator(LayerTreeMutator* mutator);
+  LayerTreeMutator* mutator() { return mutator_; }
+
   base::SingleThreadTaskRunner* GetTaskRunner() const {
     DCHECK(task_runner_provider_);
     return task_runner_provider_->HasImplThread()
@@ -823,6 +832,7 @@ class CC_EXPORT LayerTreeHostImpl
   SharedBitmapManager* shared_bitmap_manager_;
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
   TaskGraphRunner* task_graph_runner_;
+  LayerTreeMutator* mutator_;
   int id_;
 
   std::set<SwapPromiseMonitor*> swap_promise_monitor_;