cc: Remove texture scaling and clear edge texels of a layer.

cc/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_PICTURE_LAYER_TILING_H_
 #define CC_PICTURE_LAYER_TILING_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 91 matching lines @@
 
     Tile* operator->() const { return current_tile_; }
     Tile* operator*() const { return current_tile_; }
 
     Iterator& operator++();
     operator bool() const { return tile_j_ <= bottom_; }
 
    private:
     const PictureLayerTiling* tiling_;
     gfx::Rect dest_rect_;
-    float dest_to_content_scale_x_;
-    float dest_to_content_scale_y_;
+    float dest_to_content_scale_;
 
     Tile* current_tile_;
     gfx::Rect current_geometry_rect_;
     int tile_i_;
     int tile_j_;
     int left_;
     int top_;
     int right_;
     int bottom_;
 
@@ skipping 46 matching lines @@
   TileResolution resolution_;
   int last_source_frame_number_;
   double last_impl_frame_time_;
 
   friend class Iterator;
 };
 
 }  // namespace cc
 
 #endif  // CC_PICTURE_LAYER_TILING_H_