Add ability to set the border insets of a box layout.

ui/views/layout/box_layout.h

Index: ui/views/layout/box_layout.h
diff --git a/ui/views/layout/box_layout.h b/ui/views/layout/box_layout.h
index d58dabf9735211f2f796cffc9ca186600f053254..e1d22ac91a230272c013b2312cc6cfdc48bd42a5 100644
--- a/ui/views/layout/box_layout.h
+++ b/ui/views/layout/box_layout.h
@@ -64,6 +64,10 @@ class VIEWS_EXPORT BoxLayout : public LayoutManager {
     main_axis_alignment_ = main_axis_alignment;
   }
 
+  void set_inside_border_insets(const gfx::Insets& insets) {
+    inside_border_insets_ = insets;
+  }
+
   // Overridden from views::LayoutManager:
   virtual void Layout(View* host) OVERRIDE;
   virtual gfx::Size GetPreferredSize(const View* host) const OVERRIDE;