cc: Add tiling raster tile iterators.

cc/base/tiling_data.h

 // Copyright 2010 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_BASE_TILING_DATA_H_
 #define CC_BASE_TILING_DATA_H_
 
 #include <utility>
 
 #include "base/basictypes.h"
@@ skipping 71 matching lines @@
     }
 
     const TilingData* tiling_data_;
     int index_x_;
     int index_y_;
   };
 
   // Iterate through all indices whose bounds + border intersect with |rect|.
   class CC_EXPORT Iterator : public BaseIterator {
    public:
+    Iterator();
     Iterator(const TilingData* tiling_data, const gfx::Rect& tiling_rect);
     Iterator& operator++();
 
    private:
     int left_;
     int right_;
     int bottom_;
   };
 
   // Iterate through all indices whose bounds + border intersect with
@@ skipping 20 matching lines @@
     int ignore_top_;
     int ignore_right_;
     int ignore_bottom_;
   };
 
   // Iterate through all indices whose bounds + border intersect with
   // |consider| but which also do not intersect with |ignore|. The iterator
   // order is a counterclockwise spiral around the given center.
   class CC_EXPORT SpiralDifferenceIterator : public BaseIterator {
    public:
+    SpiralDifferenceIterator();
     SpiralDifferenceIterator(const TilingData* tiling_data,
                              const gfx::Rect& consider_rect,
                              const gfx::Rect& ignore_rect,
                              const gfx::Rect& center_rect);
     SpiralDifferenceIterator& operator++();
 
    private:
     bool in_consider_rect() const {
       return index_x_ >= consider_left_ && index_x_ <= consider_right_ &&
              index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
@@ skipping 56 matching lines @@
   int border_texels_;
 
   // These are computed values.
   int num_tiles_x_;
   int num_tiles_y_;
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_TILING_DATA_H_