cc: Refactor TileTaskWorkerPool.

cc/raster/raster_buffer.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_RASTER_RASTER_BUFFER_H_
 #define CC_RASTER_RASTER_BUFFER_H_
 
 #include <stdint.h>
 
 #include "cc/base/cc_export.h"
 #include "cc/playback/raster_source.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace cc {
-class RasterBuffer;
-class Resource;
-
-class CC_EXPORT RasterBufferProvider {
- public:
-  virtual std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
-      const Resource* resource,
-      uint64_t resource_content_id,
-      uint64_t previous_content_id) = 0;
-  virtual void ReleaseBufferForRaster(std::unique_ptr<RasterBuffer> buffer) = 0;
-
- protected:
-  virtual ~RasterBufferProvider() {}
-};
 
 class CC_EXPORT RasterBuffer {
  public:
   RasterBuffer();
   virtual ~RasterBuffer();
 
   virtual void Playback(
       const RasterSource* raster_source,
       const gfx::Rect& raster_full_rect,
       const gfx::Rect& raster_dirty_rect,
       uint64_t new_content_id,
       float scale,
       const RasterSource::PlaybackSettings& playback_settings) = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_RASTER_BUFFER_H_