A couple of fixes to bubble view:

ui/views/bubble/bubble_frame_view.cc

Index: ui/views/bubble/bubble_frame_view.cc
diff --git a/ui/views/bubble/bubble_frame_view.cc b/ui/views/bubble/bubble_frame_view.cc
index c7efa375752b4bdf136e9b9fab0f99b84bc18b16..848df34fecd2ea2d865dda1f10d749878f9b97fb 100644
--- a/ui/views/bubble/bubble_frame_view.cc
+++ b/ui/views/bubble/bubble_frame_view.cc
@@ -184,6 +184,8 @@ gfx::Rect BubbleFrameView::GetUpdatedWindowBounds(const gfx::Rect& anchor_rect,
       MirrorArrowIfOffScreen(true, anchor_rect, client_size);
       MirrorArrowIfOffScreen(false, anchor_rect, client_size);
     } else {
+      MirrorArrowIfOffScreen(BubbleBorder::is_arrow_on_horizontal(arrow),

[msw, 2013/03/14 20:17:58]

nit: Add a minor comment like "Mirror as needed vertically if the arrow is on a
horizontal edge and vice-versa."

[varunjain, 2013/03/14 20:54:59]

Done.

+          anchor_rect, client_size);
       OffsetArrowIfOffScreen(anchor_rect, client_size);
     }
   }