cc: GPU rasterize tiles synchronously in PrepareToDraw.

cc/resources/gpu_tile_task_worker_pool.h

 // Copyright 2014 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_GPU_TILE_TASK_WORKER_POOL_H_
 #define CC_RESOURCES_GPU_TILE_TASK_WORKER_POOL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "cc/resources/tile_task_runner.h"
 #include "cc/resources/tile_task_worker_pool.h"
 #include "third_party/skia/include/core/SkMultiPictureDraw.h"
 
 namespace cc {
 class ContextProvider;
 class ResourceProvider;
 
 class CC_EXPORT GpuTileTaskWorkerPool : public TileTaskWorkerPool,
                                         public TileTaskRunner,
                                         public TileTaskClient {
  public:
   ~GpuTileTaskWorkerPool() override;
 
   static scoped_ptr<TileTaskWorkerPool> Create(
       base::SequencedTaskRunner* task_runner,
+      TaskGraphRunner* task_graph_runner,
       ContextProvider* context_provider,
       ResourceProvider* resource_provider,
       bool use_distance_field_text);
 
   // Overridden from TileTaskWorkerPool:
   TileTaskRunner* AsTileTaskRunner() override;
 
   // Overridden from TileTaskRunner:
   void SetClient(TileTaskRunnerClient* client) override;
   void Shutdown() override;
   void ScheduleTasks(TileTaskQueue* queue) override;
   void CheckForCompletedTasks() override;
 
   // Overridden from TileTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource) override;
   void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
 
  private:
   GpuTileTaskWorkerPool(base::SequencedTaskRunner* task_runner,
+                        TaskGraphRunner* task_graph_runner,
                         ContextProvider* context_provider,
                         ResourceProvider* resource_provider,
                         bool use_distance_field_text);
 
   void OnTaskSetFinished(TaskSet task_set);
-  void ScheduleRunTasksOnOriginThread();
-  void RunTasksOnOriginThread();
-  void RunTaskOnOriginThread(TileTask* task);
+  void CompleteTasks(const Task::Vector& tasks);
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  scoped_ptr<TaskGraphRunner> task_graph_runner_;
+  TaskGraphRunner* task_graph_runner_;
   const NamespaceToken namespace_token_;
   TileTaskRunnerClient* client_;
   ContextProvider* context_provider_;
   ResourceProvider* resource_provider_;
   SkMultiPictureDraw multi_picture_draw_;
 
   bool run_tasks_on_origin_thread_pending_;
   bool use_distance_field_text_;
 
   TaskSetCollection tasks_pending_;
 
   scoped_refptr<TileTask> task_set_finished_tasks_[kNumberOfTaskSets];
 
   // Task graph used when scheduling tasks and vector used to gather
   // completed tasks.
   TaskGraph graph_;
   Task::Vector completed_tasks_;
 
   base::WeakPtrFactory<GpuTileTaskWorkerPool>
       task_set_finished_weak_ptr_factory_;
 
   base::WeakPtrFactory<GpuTileTaskWorkerPool> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuTileTaskWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_GPU_TILE_TASK_WORKER_POOL_H_