cc: Use ExpandRectIgnoringBordersToTileBoundsWithBordersEmpty.

cc/resources/picture_layer_tiling.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/picture_layer_tiling.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
@@ skipping 156 matching lines @@
     Invalidate(layer_invalidation);
   }
 
   PicturePileImpl* pile = client_->GetPile();
   for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end(); ++it)
     it->second->set_picture_pile(pile);
 }
 
 void PictureLayerTiling::Invalidate(const Region& layer_region) {
   std::vector<TileMapKey> new_tile_keys;
-  // TODO(danakj): What we really want is to ignore border pixels that intersect
-  // the rect when choosing which tiles it covers, then expand to those tiles
-  // plus their border pixels.
   gfx::Rect expanded_live_tiles_rect =
-      tiling_data_.ExpandRectToTileBounds(live_tiles_rect_);
+      tiling_data_.ExpandRectIgnoringBordersToTileBoundsWithBorders(
+          live_tiles_rect_);
   for (Region::Iterator iter(layer_region); iter.has_rect(); iter.next()) {
     gfx::Rect layer_rect = iter.rect();
     gfx::Rect content_rect =
         gfx::ScaleToEnclosingRect(layer_rect, contents_scale_);
     // Avoid needless work by not bothering to invalidate where there aren't
     // tiles.
     content_rect.Intersect(expanded_live_tiles_rect);
     if (content_rect.IsEmpty())
       continue;
     bool include_borders = true;
@@ skipping 773 matching lines @@
   tiling_->UpdateEvictionCacheIfNeeded(tree_priority_);
   tile_iterator_ = tiling_->eviction_tiles_cache_.begin();
   is_valid_ = true;
   if (tile_iterator_ != tiling_->eviction_tiles_cache_.end() &&
       !(*tile_iterator_)->HasResources()) {
     ++(*this);
   }
 }
 
 }  // namespace cc