Move visual rect unioning between paired items to cc::DisplayItemList.

ui/views/view.cc

Index: ui/views/view.cc
diff --git a/ui/views/view.cc b/ui/views/view.cc
index be3bbf5b7ed29370ae2f344bf04420ee029dbe93..3da5ce03e9bebc312f4d49c315c256f4c895cf69 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -826,7 +826,7 @@ void View::Paint(const ui::PaintContext& parent_context) {
     transform_from_parent.Translate(offset_from_parent.x(),
                                     offset_from_parent.y());
     transform_from_parent.PreconcatTransform(GetTransform());
-    transform_recorder.Transform(transform_from_parent, size());
+    transform_recorder.Transform(transform_from_parent);
   }
 
   // Note that the cache is not aware of the offset of the view