cc: Simplify task and its derived classes.

cc/raster/tile_task_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_RASTER_TILE_TASK_WORKER_POOL_H_
 #define CC_RASTER_TILE_TASK_WORKER_POOL_H_
 
 #include <stddef.h>
 
 #include "cc/playback/raster_source.h"
 #include "cc/raster/tile_task_runner.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace cc {
 class RenderingStatsInstrumentation;
 
 class CC_EXPORT TileTaskWorkerPool {
  public:
   TileTaskWorkerPool();
   virtual ~TileTaskWorkerPool();
 
   // Utility function that can be used to call ::ScheduleOnOriginThread() for
   // each task in |graph|.
-  static void ScheduleTasksOnOriginThread(TileTaskClient* client,
-                                          TaskGraph* graph);
+  static void ScheduleTasksOnOriginThread(TaskGraph* graph);
 
   // Utility function that will create a temporary bitmap and copy pixels to
   // |memory| when necessary. The |canvas_bitmap_rect| is the rect of the bitmap
   // being played back in the pixel space of the source, ie a rect in the source
   // that will cover the resulting |memory|. The |canvas_playback_rect| can be a
   // smaller contained rect inside the |canvas_bitmap_rect| if the |memory| is
   // already partially complete, and only the subrect needs to be played back.
   static void PlaybackToMemory(
       void* memory,
       ResourceFormat format,
       const gfx::Size& size,
       size_t stride,
       const RasterSource* raster_source,
       const gfx::Rect& canvas_bitmap_rect,
       const gfx::Rect& canvas_playback_rect,
       float scale,
       const RasterSource::PlaybackSettings& playback_settings);
 
   // Type-checking downcast routine.
   virtual TileTaskRunner* AsTileTaskRunner() = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_TILE_TASK_WORKER_POOL_H_