cc: Rename PictureLayerTiling(Set) Iterator to CoverageIterator

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 <utility>
 #include <vector>
 
@@ skipping 62 matching lines @@
 
   static gfx::Rect ExpandRectEquallyToAreaBoundedBy(
       gfx::Rect starting_rect,
       int64 target_area,
       gfx::Rect bounding_rect);
 
   // Iterate over all tiles to fill content_rect.  Even if tiles are invalid
   // (i.e. no valid resource) this tiling should still iterate over them.
   // The union of all geometry_rect calls for each element iterated over should
   // exactly equal content_rect and no two geometry_rects should intersect.
-  class CC_EXPORT Iterator {
+  class CC_EXPORT CoverageIterator {
    public:
-    Iterator();
-    Iterator(const PictureLayerTiling* tiling,
+    CoverageIterator();
+    CoverageIterator(const PictureLayerTiling* tiling,
         float dest_scale,
         gfx::Rect rect);
-    ~Iterator();
+    ~CoverageIterator();
 
     // Visible rect (no borders), always in the space of content_rect,
     // regardless of the contents scale of the tiling.
     gfx::Rect geometry_rect() const;
     // Texture rect (in texels) for geometry_rect
     gfx::RectF texture_rect() const;
     gfx::Size texture_size() const;
 
     // Full rect (including borders) of the current tile, always in the space
     // of content_rect, regardless of the contents scale of the tiling.
     gfx::Rect full_tile_geometry_rect() const;
 
     Tile* operator->() const { return current_tile_; }
     Tile* operator*() const { return current_tile_; }
 
-    Iterator& operator++();
+    CoverageIterator& operator++();
     operator bool() const { return tile_j_ <= bottom_; }
 
    private:
     const PictureLayerTiling* tiling_;
     gfx::Rect dest_rect_;
     float dest_to_content_scale_;
 
     Tile* current_tile_;
     gfx::Rect current_geometry_rect_;
     int tile_i_;
@@ skipping 45 matching lines @@
   float contents_scale_;
   gfx::Size layer_bounds_;
   gfx::Rect last_prioritized_rect_;
   // It is not legal to have a NULL tile in the tiles_ map.
   TileMap tiles_;
   TilingData tiling_data_;
   TileResolution resolution_;
   int last_source_frame_number_;
   double last_impl_frame_time_;
 
-  friend class Iterator;
+  friend class CoverageIterator;
 
  private:
   DISALLOW_ASSIGN(PictureLayerTiling);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_H_