cc: Apply contents scales to impl-side painting rasterization

cc/tile.cc

 // 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.
 
 #include "cc/tile.h"
 
 #include "cc/tile_manager.h"
 #include "third_party/khronos/GLES2/gl2.h"
 
 namespace cc {
 
 Tile::Tile(TileManager* tile_manager,
            PicturePileImpl* picture_pile,
            gfx::Size tile_size,
            GLenum format,
-           gfx::Rect rect_inside_picture)
+           gfx::Rect rect_inside_picture,
+           float contents_scale)
   : tile_manager_(tile_manager),
     picture_pile_(picture_pile),
     tile_size_(tile_size),
     format_(format),
-    rect_inside_picture_(rect_inside_picture) {
+    rect_inside_picture_(rect_inside_picture),
+    contents_scale_(contents_scale) {
   tile_manager_->RegisterTile(this);
 }
 
 Tile::~Tile() {
   tile_manager_->UnregisterTile(this);
 }
 
 void Tile::set_priority(WhichTree tree, const TilePriority& priority) {
   tile_manager_->WillModifyTilePriority(this, tree, priority);
   priority_[tree] = priority;
 }
 
 size_t Tile::bytes_consumed_if_allocated() const {
   DCHECK(format_ == GL_RGBA);
   return 4 * tile_size_.width() * tile_size_.height();
 }
 
 }  // namespace cc