cc: Apply contents scales to impl-side painting rasterization

cc/tile.cc

Index: cc/tile.cc
diff --git a/cc/tile.cc b/cc/tile.cc
index 287edf31e75dbc22378464bd7638938b312d35e8..1b04a5dac5288a84394f67a317614370c48ca710 100644
--- a/cc/tile.cc
+++ b/cc/tile.cc
@@ -13,12 +13,14 @@ 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);
 }