Add main axis alignment for BoxLayout.

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 7670d8cb05e7bd15b59771b2e95c3ade65aabf84..65fdbe05583968fcefa5bf74330494206877318c 100644
--- a/ui/views/layout/box_layout.h
+++ b/ui/views/layout/box_layout.h
@@ -30,6 +30,12 @@ class VIEWS_EXPORT BoxLayout : public LayoutManager {
     kVertical,
   };
 
+  enum BoxPack {
+    BOX_PACK_START,
+    BOX_PACK_CENTER,
+    BOX_PACK_END,
+  };
+
   // Use |inside_border_horizontal_spacing| and
   // |inside_border_vertical_spacing| to add additional space between the child
   // view area and the host view border. |between_child_spacing| controls the
@@ -44,6 +50,8 @@ class VIEWS_EXPORT BoxLayout : public LayoutManager {
     spread_blank_space_ = spread;
   }
 
+  void set_box_pack(BoxPack box_pack) { box_pack_ = box_pack; }

[benwells, 2014/05/13 02:48:05]

Comment what this is, and mention what the default is.

[calamity, 2014/05/13 04:29:29]

Is the member comment not enough?

+
   // Overridden from views::LayoutManager:
   virtual void Layout(View* host) OVERRIDE;
   virtual gfx::Size GetPreferredSize(View* host) OVERRIDE;
@@ -69,6 +77,9 @@ class VIEWS_EXPORT BoxLayout : public LayoutManager {
   // views.
   bool spread_blank_space_;
 
+  // The alignment of children in the main axis.
+  BoxPack box_pack_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(BoxLayout);
 };