cc: Spiral iterator fix for negative center.

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 161 matching lines @@
 
     Direction direction_;
     int delta_x_;
     int delta_y_;
     int current_step_;
     int horizontal_step_count_;
     int vertical_step_count_;
   };
 
  private:
-  std::pair<int, int> UnclampedFirstBorderTileIndexFromSrcCoord(int x,
-                                                                int y) const;
-  std::pair<int, int> UnclampedLastBorderTileIndexFromSrcCoord(int x,
-                                                               int y) const;
-
   void AssertTile(int i, int j) const {
     DCHECK_GE(i,  0);
     DCHECK_LT(i, num_tiles_x_);
     DCHECK_GE(j, 0);
     DCHECK_LT(j, num_tiles_y_);
   }
 
   void RecomputeNumTiles();
 
   gfx::Size max_texture_size_;
   gfx::Size total_size_;
   int border_texels_;
 
   // These are computed values.
   int num_tiles_x_;
   int num_tiles_y_;
 };
 
 }  // namespace cc
 
 #endif  // CC_BASE_TILING_DATA_H_