cc: Rename picture layer tiling method to reflect its new functionality.

cc/resources/picture_layer_tiling.h

Index: cc/resources/picture_layer_tiling.h
diff --git a/cc/resources/picture_layer_tiling.h b/cc/resources/picture_layer_tiling.h
index ad56a2481da6413e4c4ae2e1de8128580a8b89d1..508c194f0dd4ac8ff3b935145365fa74c33c86ba 100644
--- a/cc/resources/picture_layer_tiling.h
+++ b/cc/resources/picture_layer_tiling.h
@@ -117,7 +117,7 @@ class CC_EXPORT PictureLayerTiling {
   }
   void UpdateAllTilePrioritiesForTesting() {
     for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end(); ++it)
-      UpdateTileAndTwinPriority(it->second.get());
+      UpdateTilePriority(it->second.get());
   }
   std::vector<scoped_refptr<Tile>> AllRefTilesForTesting() const {
     std::vector<scoped_refptr<Tile>> all_tiles;
@@ -275,7 +275,7 @@ class CC_EXPORT PictureLayerTiling {
   bool IsTileOccludedOnCurrentTree(const Tile* tile) const;
   bool ShouldCreateTileAt(int i, int j) const;
   bool IsTileOccluded(const Tile* tile) const;
-  void UpdateTileAndTwinPriority(Tile* tile) const;
+  void UpdateTilePriority(Tile* tile) const;
   TilePriority ComputePriorityForTile(const Tile* tile) const;
   bool has_visible_rect_tiles() const { return has_visible_rect_tiles_; }
   bool has_skewport_rect_tiles() const { return has_skewport_rect_tiles_; }