cc: Generalize raster task notifications

cc/resources/raster_worker_pool.h

 // Copyright 2013 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_RESOURCES_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_RASTER_WORKER_POOL_H_
 
 #include "cc/resources/rasterizer.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace cc {
 
 class CC_EXPORT RasterWorkerPool {
  public:
   static unsigned kOnDemandRasterTaskPriority;
   static unsigned kBenchmarkRasterTaskPriority;
   static unsigned kRasterFinishedTaskPriority;
-  static unsigned kRasterRequiredForActivationFinishedTaskPriority;
   static unsigned kRasterTaskPriorityBase;
 
   RasterWorkerPool();
   virtual ~RasterWorkerPool();
 
   // Set the number of threads to use for the global TaskGraphRunner instance.
   // This can only be called once and must be called prior to
   // GetNumRasterThreads().
   static void SetNumRasterThreads(int num_threads);
 
   // Returns the number of threads used for the global TaskGraphRunner instance.
   static int GetNumRasterThreads();
 
   // Returns a pointer to the global TaskGraphRunner instance.
   static TaskGraphRunner* GetTaskGraphRunner();
 
   // Utility function that can be used to create a "raster finished" task that
   // posts |callback| to |task_runner| when run.
   static scoped_refptr<RasterizerTask> CreateRasterFinishedTask(
       base::SequencedTaskRunner* task_runner,
       const base::Closure& callback);
 
-  // Utility function that can be used to create a "raster required for
-  // activation finished" task that posts |callback| to |task_runner| when run.
-  static scoped_refptr<RasterizerTask>
-      CreateRasterRequiredForActivationFinishedTask(
-          size_t tasks_required_for_activation_count,
-          base::SequencedTaskRunner* task_runner,
-          const base::Closure& callback);
-
   // Utility function that can be used to call ::ScheduleOnOriginThread() for
   // each task in |graph|.
   static void ScheduleTasksOnOriginThread(RasterizerTaskClient* client,
                                           TaskGraph* graph);
 
   // Utility function that can be used to build a task graph. Inserts a node
   // that represents |task| in |graph|. See TaskGraph definition for valid
   // |priority| values.
   static void InsertNodeForTask(TaskGraph* graph,
                                 RasterizerTask* task,
                                 unsigned priority,
                                 size_t dependencies);
 
   // Utility function that can be used to build a task graph. Inserts nodes that
   // represent |task| and all its image decode dependencies in |graph|.
   static void InsertNodesForRasterTask(
       TaskGraph* graph,
       RasterTask* task,
       const ImageDecodeTask::Vector& decode_tasks,
       unsigned priority);
 
   // Type-checking downcast routine.
   virtual Rasterizer* AsRasterizer() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTER_WORKER_POOL_H_