cc: Move LayerEvictionTileIterator to a separate file and make it a queue

cc/resources/picture_layer_tiling.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_RESOURCES_PICTURE_LAYER_TILING_H_
 #define CC_RESOURCES_PICTURE_LAYER_TILING_H_
 
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 282 matching lines @@
       RectExpansionCache* cache);
 
   bool has_ever_been_updated() const {
     return last_impl_frame_time_in_seconds_ != 0.0;
   }
 
  protected:
   friend class CoverageIterator;
   friend class TilingRasterTileIterator;
   friend class TilingEvictionTileIterator;
+  friend class TilingSetEvictionQueue;
 
   typedef std::pair<int, int> TileMapKey;
   typedef base::hash_map<TileMapKey, scoped_refptr<Tile>> TileMap;
 
   PictureLayerTiling(float contents_scale,
                      const gfx::Size& layer_bounds,
                      PictureLayerTilingClient* client);
   void SetLiveTilesRect(const gfx::Rect& live_tiles_rect);
   void VerifyLiveTilesRect();
   Tile* CreateTile(int i, int j, const PictureLayerTiling* twin_tiling);
@@ skipping 67 matching lines @@
 
  private:
   DISALLOW_ASSIGN(PictureLayerTiling);
 
   RectExpansionCache expansion_cache_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_H_