Move TaskGraph creation to TileManager

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 b1015593245d12af3d39a272680dee4c32774224..3ca9b06ff0b5160131c0ac598bc3bc369b50db13 100644
--- a/cc/raster/zero_copy_tile_task_worker_pool.h
+++ b/cc/raster/zero_copy_tile_task_worker_pool.h
@@ -35,9 +35,8 @@ class CC_EXPORT ZeroCopyTileTaskWorkerPool : public TileTaskWorkerPool,
   TileTaskRunner* AsTileTaskRunner() override;
 
   // Overridden from TileTaskRunner:
-  void SetClient(TileTaskRunnerClient* client) override;
   void Shutdown() override;
-  void ScheduleTasks(TileTaskQueue* queue) override;
+  void ScheduleTasks(TaskGraph* graph) override;
   void CheckForCompletedTasks() override;
   ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
   bool GetResourceRequiresSwizzle(bool must_support_alpha) const override;
@@ -56,30 +55,18 @@ class CC_EXPORT ZeroCopyTileTaskWorkerPool : public TileTaskWorkerPool,
                              bool use_rgba_4444_texture_format);
 
  private:
-  void OnTaskSetFinished(TaskSet task_set);
   scoped_refptr<base::trace_event::ConvertableToTraceFormat> StateAsValue()
       const;
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   TaskGraphRunner* task_graph_runner_;
   const NamespaceToken namespace_token_;
-  TileTaskRunnerClient* client_;
   ResourceProvider* resource_provider_;
 
   bool use_rgba_4444_texture_format_;
 
-  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<ZeroCopyTileTaskWorkerPool>
-      task_set_finished_weak_ptr_factory_;
-
   DISALLOW_COPY_AND_ASSIGN(ZeroCopyTileTaskWorkerPool);
 };