cc: Refactor TileTaskWorkerPool.

cc/raster/zero_copy_tile_task_worker_pool.h

Index: cc/raster/zero_copy_tile_task_worker_pool.h
diff --git a/cc/raster/zero_copy_tile_task_worker_pool.h b/cc/raster/zero_copy_tile_task_worker_pool.h
index 7a78233c5bab0e37513c7e8a63befa40e68be437..623a10021abbe63d453f725adddf0c4f887bcde7 100644
--- a/cc/raster/zero_copy_tile_task_worker_pool.h
+++ b/cc/raster/zero_copy_tile_task_worker_pool.h
@@ -27,15 +27,11 @@ class CC_EXPORT ZeroCopyTileTaskWorkerPool : public TileTaskWorkerPool,
   ~ZeroCopyTileTaskWorkerPool() override;
 
   static std::unique_ptr<TileTaskWorkerPool> Create(
-      base::SequencedTaskRunner* task_runner,
-      TaskGraphRunner* task_graph_runner,
       ResourceProvider* resource_provider,
       ResourceFormat preferred_tile_format);
 
   // Overridden from TileTaskWorkerPool:
-  void Shutdown() override;
-  void ScheduleTasks(TaskGraph* graph) override;
-  void CheckForCompletedTasks() override;
+  void BarrierToSyncResources() override;
   ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
   bool GetResourceRequiresSwizzle(bool must_support_alpha) const override;
   RasterBufferProvider* AsRasterBufferProvider() override;
@@ -48,24 +44,16 @@ class CC_EXPORT ZeroCopyTileTaskWorkerPool : public TileTaskWorkerPool,
   void ReleaseBufferForRaster(std::unique_ptr<RasterBuffer> buffer) override;
 
  protected:
-  ZeroCopyTileTaskWorkerPool(base::SequencedTaskRunner* task_runner,
-                             TaskGraphRunner* task_graph_runner,
-                             ResourceProvider* resource_provider,
+  ZeroCopyTileTaskWorkerPool(ResourceProvider* resource_provider,
                              ResourceFormat preferred_tile_format);
 
  private:
   std::unique_ptr<base::trace_event::ConvertableToTraceFormat> StateAsValue()
       const;
 
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  TaskGraphRunner* task_graph_runner_;
-  const NamespaceToken namespace_token_;
   ResourceProvider* resource_provider_;
-
   ResourceFormat preferred_tile_format_;
 
-  Task::Vector completed_tasks_;
-
   DISALLOW_COPY_AND_ASSIGN(ZeroCopyTileTaskWorkerPool);
 };