Makes tile-creation lazy

cc/resources/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/resources/tile.h"
 
 #include "base/stringprintf.h"
 #include "cc/resources/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 content_rect,
+           gfx::Rect paint_rect,
            gfx::Rect opaque_rect,
            float contents_scale,
            int layer_id)
   : tile_manager_(tile_manager),
     tile_size_(tile_size),
     format_(format),
     content_rect_(content_rect),
+    paint_rect_(paint_rect),
     contents_scale_(contents_scale),
     opaque_rect_(opaque_rect),
     layer_id_(layer_id) {
   set_picture_pile(picture_pile);
   tile_manager_->RegisterTile(this);
 }
 
 Tile::~Tile() {
   tile_manager_->UnregisterTile(this);
 }
@@ skipping 12 matching lines @@
 
 void Tile::SetPriority(WhichTree tree, const TilePriority& priority) {
   if (priority_[tree] == priority)
     return;
 
   tile_manager_->WillModifyTilePriority(this, tree, priority);
   priority_[tree] = priority;
 }
 
 }  // namespace cc