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 100 matching lines @@
 
     PictureLayerTiling* tiling_;
 
     Phase phase_;
 
     Tile* current_tile_;
     TilingData::Iterator visible_iterator_;
     TilingData::SpiralDifferenceIterator spiral_iterator_;
   };
 
-  class CC_EXPORT TilingEvictionTileIterator {
-   public:
-    TilingEvictionTileIterator();
-    TilingEvictionTileIterator(PictureLayerTiling* tiling,
-                               TreePriority tree_priority,
-                               EvictionCategory category);
-    ~TilingEvictionTileIterator();
-
-    operator bool() const;
-    const Tile* operator*() const;
-    Tile* operator*();
-    TilingEvictionTileIterator& operator++();
-
-   private:
-    const std::vector<Tile*>* eviction_tiles_;
-    size_t current_eviction_tiles_index_;
-  };
-
   ~PictureLayerTiling();
 
   // Create a tiling with no tiles.  CreateTiles must be called to add some.
   static scoped_ptr<PictureLayerTiling> Create(
       float contents_scale,
       const gfx::Size& layer_bounds,
       PictureLayerTilingClient* client);
   gfx::Size layer_bounds() const { return layer_bounds_; }
   void UpdateTilesToCurrentRasterSource(RasterSource* raster_source,
                                         const Region& layer_invalidation,
@@ skipping 143 matching lines @@
       const gfx::Rect& bounding_rect,
       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_