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/task_graph_runner.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;
@@ skipping 25 matching lines @@
       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_