Fixing tile grid size used by cc:Picture to make it respect current tile configuration

cc/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_TILING_DATA_H_
 #define CC_TILING_DATA_H_
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "cc/cc_export.h"
@@ skipping 16 matching lines @@
   TilingData(
       gfx::Size max_texture_size,
       gfx::Size total_size,
       int border_texels);
 
   gfx::Size total_size() const { return total_size_; }
   void SetTotalSize(const gfx::Size total_size);
 
   gfx::Size max_texture_size() const { return max_texture_size_; }
   void SetMaxTextureSize(gfx::Size max_texture_size);
+  gfx::Size TileStride() const;
 
   int border_texels() const { return border_texels_; }
   void SetHasBorderTexels(bool has_border_texels);
   void SetBorderTexels(int border_texels);
 
   bool has_empty_bounds() const { return !num_tiles_x_ || !num_tiles_y_; }
   int num_tiles_x() const { return num_tiles_x_; }
   int num_tiles_y() const { return num_tiles_y_; }
   // Return the tile index whose non-border texels include src_position.
   int TileXIndexFromSrcCoord(int src_position) const;
@@ skipping 87 matching lines @@
   int border_texels_;
 
   // These are computed values.
   int num_tiles_x_;
   int num_tiles_y_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILING_DATA_H_