Remove the default format from ResourcePool.

cc/resources/software_rasterizer.h

 // Copyright 2015 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_RESOURCES_SOFTWARE_RASTERIZER_H_
 #define CC_RESOURCES_SOFTWARE_RASTERIZER_H_
 
 #include <vector>
 
 #include "cc/base/cc_export.h"
 #include "cc/resources/rasterizer.h"
 
 namespace cc {
 
 // This class only returns |PrepareTilesMode::RASTERIZE_PRIORITIZED_TILES| in
 // |GetPrepareTilesMode()| to tell rasterize as scheduled tasks.
 class CC_EXPORT SoftwareRasterizer : public Rasterizer {
  public:
   ~SoftwareRasterizer() override;
 
   static scoped_ptr<SoftwareRasterizer> Create();
 
   PrepareTilesMode GetPrepareTilesMode() override;
   void RasterizeTiles(
       const TileVector& tiles,
       ResourcePool* resource_pool,
+      ResourceFormat resource_format,
       const UpdateTileDrawInfoCallback& update_tile_draw_info) override;
 
  private:
   SoftwareRasterizer();
 
   DISALLOW_COPY_AND_ASSIGN(SoftwareRasterizer);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_SOFTWARE_RASTERIZER_H_