[ash-md] Updates ash shelf tooltips to MD

ui/views/bubble/bubble_border.h

Index: ui/views/bubble/bubble_border.h
diff --git a/ui/views/bubble/bubble_border.h b/ui/views/bubble/bubble_border.h
index 2ebdf9c6156f842ec77a22cc65474d207c45e16d..c2d874559f2f18c75f2181c99d1fd7ff1a36d218 100644
--- a/ui/views/bubble/bubble_border.h
+++ b/ui/views/bubble/bubble_border.h
@@ -205,6 +205,10 @@ class VIEWS_EXPORT BubbleBorder : public Border {
   // The returned path does not account for arrow stroke and shadow.
   bool GetArrowPath(const gfx::Rect& view_bounds, gfx::Path* path) const;
 
+  // Sets border thickness overriding the thickness set on |images_| creation.
+  // May only be invoked after |arrow_paint_type_| has been set.
+  void SetBorderInteriorThickness(int border_interior_thickness);
+
   // Overridden from Border:
   void Paint(const View& view, gfx::Canvas* canvas) override;
   gfx::Insets GetInsets() const override;