Lands http://codereview.chromium.org/201102 for Oshima:

Don't allow updating group id once it's set.


BUG=none
TEST=none


Review URL: http://codereview.chromium.org/205001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@26132 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/views/view.h b/views/view.h
index 66ef76f..764cbd3 100644
--- a/views/view.h
+++ b/views/view.h
@@ -454,7 +454,9 @@
   // A group id is used to tag views which are part of the same logical group.
   // Focus can be moved between views with the same group using the arrow keys.
   // Groups are currently used to implement radio button mutual exclusion.
+  // The group id is immutable once it's set.
   void SetGroup(int gid);
+  // Returns the group id of the view, or -1 if the id is not set yet.
   int GetGroup() const;
 
   // If this returns true, the views from the same group can each be focused