cc: Optimize decode scheduling for checker-images.

cc/tiles/tile.h

 // Copyright 2012 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_TILES_TILE_H_
 #define CC_TILES_TILE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 95 matching lines @@
 
   bool HasRasterTask() const { return !!raster_task_.get(); }
 
   void set_solid_color_analysis_performed(bool performed) {
     is_solid_color_analysis_performed_ = performed;
   }
   bool is_solid_color_analysis_performed() const {
     return is_solid_color_analysis_performed_;
   }
 
+  void set_is_checker_imaged() { is_checker_imaged_ = true; }
+  bool is_checker_imaged() const { return is_checker_imaged_; }
+
   const PictureLayerTiling* tiling() const { return tiling_; }
   void set_tiling(const PictureLayerTiling* tiling) { tiling_ = tiling; }
 
  private:
   friend class TileManager;
   friend class FakeTileManager;
   friend class FakePictureLayerImpl;
 
   // Methods called by by tile manager.
   Tile(TileManager* tile_manager,
@@ skipping 11 matching lines @@
   TileDrawInfo draw_info_;
 
   const int layer_id_;
   const int source_frame_number_;
   const int flags_;
   const int tiling_i_index_;
   const int tiling_j_index_;
   bool required_for_activation_ : 1;
   bool required_for_draw_ : 1;
   bool is_solid_color_analysis_performed_ : 1;
+  bool is_checker_imaged_ = false;
 
   Id id_;
 
   // The rect bounding the changes in this Tile vs the previous tile it
   // replaced.
   gfx::Rect invalidated_content_rect_;
   // The |id_| of the Tile that was invalidated and replaced by this tile.
   Id invalidated_id_;
 
   unsigned scheduled_priority_;
   scoped_refptr<TileTask> raster_task_;
 
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_TILE_H_