cc: Use ExpandRectIgnoringBordersToTileBoundsWithBordersEmpty.

cc/resources/picture_layer_tiling.cc

Index: cc/resources/picture_layer_tiling.cc
diff --git a/cc/resources/picture_layer_tiling.cc b/cc/resources/picture_layer_tiling.cc
index da2412159737a1f7ee35332e8119d74d15f69c18..9a9c758388a3c77a7caeca0450887f19dfdd54b4 100644
--- a/cc/resources/picture_layer_tiling.cc
+++ b/cc/resources/picture_layer_tiling.cc
@@ -174,11 +174,9 @@ void PictureLayerTiling::UpdateTilesToCurrentPile(
 
 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 =