Revert of cc: Remove tile sharing from tilings.

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 114 matching lines @@
     int ignore_left_;
     int ignore_top_;
     int ignore_right_;
     int ignore_bottom_;
   };
 
   // Iterate through all indices whose bounds (not including borders) intersect
   // with |consider| but which also do not intersect with |ignore|.
   class CC_EXPORT DifferenceIterator : public BaseDifferenceIterator {
    public:
-    DifferenceIterator();
     DifferenceIterator(const TilingData* tiling_data,
                        const gfx::Rect& consider_rect,
                        const gfx::Rect& ignore_rect);
     DifferenceIterator& operator++();
   };
 
   // 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 BaseDifferenceIterator {
@@ skipping 91 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_