Squashed commit of the following:

commit e5c24638f98162c3b75b4c67a16b510d38e31341
Author: Mathias Agopian <mathias@google.com>
Date:   Fri Apr 17 14:09:03 2009 -0700

    oops forgot this file.

commit 282642632d0cb12882eecf42e0fdfb2343275de1
Author: Mathias Agopian <mathias@google.com>
Date:   Fri Apr 17 14:07:32 2009 -0700

    use a helper macro for creating Singleton<>'s static attributes instances.