Re-land: cc: Add raster finished signals to RasterWorkerPool.

cc/resources/raster_worker_pool.h

Index: cc/resources/raster_worker_pool.h
diff --git a/cc/resources/raster_worker_pool.h b/cc/resources/raster_worker_pool.h
index c868be757903354a754900206cfab8e503970dcf..4e628c4aa5c140f44839d17f6900258d06f32a8d 100644
--- a/cc/resources/raster_worker_pool.h
+++ b/cc/resources/raster_worker_pool.h
@@ -102,6 +102,8 @@ struct RasterTaskMetadata {
 class CC_EXPORT RasterWorkerPoolClient {
  public:
   virtual bool ShouldForceTasksRequiredForActivationToComplete() const = 0;
+  virtual void DidFinishedRunningTasks() = 0;
+  virtual void DidFinishedRunningTasksRequiredForActivation() = 0;
 
  protected:
   virtual ~RasterWorkerPoolClient() {}
@@ -235,14 +237,15 @@ class CC_EXPORT RasterWorkerPool : public WorkerPool {
     ~RasterTaskGraph();
 
     void InsertRasterTask(internal::WorkerPoolTask* raster_task,
-                          const TaskVector& decode_tasks);
+                          const TaskVector& decode_tasks,
+                          bool required_for_activation);
 
    private:
     friend class RasterWorkerPool;
 
     TaskGraph graph_;
-    scoped_refptr<internal::WorkerPoolTask> raster_finished_task_;
     scoped_ptr<GraphNode> raster_finished_node_;
+    scoped_ptr<GraphNode> raster_required_for_activation_finished_node_;
     unsigned next_priority_;
 
     DISALLOW_COPY_AND_ASSIGN(RasterTaskGraph);
@@ -250,7 +253,8 @@ class CC_EXPORT RasterWorkerPool : public WorkerPool {
 
   RasterWorkerPool(ResourceProvider* resource_provider, size_t num_threads);
 
-  virtual void OnRasterTasksFinished() {}
+  virtual void OnRasterTasksFinished() = 0;
+  virtual void OnRasterTasksRequiredForActivationFinished() = 0;
 
   void SetRasterTasks(RasterTask::Queue* queue);
   void SetRasterTaskGraph(RasterTaskGraph* graph);
@@ -265,6 +269,8 @@ class CC_EXPORT RasterWorkerPool : public WorkerPool {
 
  private:
   void OnRasterFinished(int64 schedule_raster_tasks_count);
+  void OnRasterRequiredForActivationFinished(
+      int64 schedule_raster_tasks_count);
 
   RasterWorkerPoolClient* client_;
   ResourceProvider* resource_provider_;
@@ -273,6 +279,8 @@ class CC_EXPORT RasterWorkerPool : public WorkerPool {
 
   base::WeakPtrFactory<RasterWorkerPool> weak_ptr_factory_;
   scoped_refptr<internal::WorkerPoolTask> raster_finished_task_;
+  scoped_refptr<internal::WorkerPoolTask>
+      raster_required_for_activation_finished_task_;
   int64 schedule_raster_tasks_count_;
 };