
Add a new API that allows registration of "late" callbacks - normal initialization callbacks are registered as early module callbacks, these callbacks map to normal module callbacks.

I ran the idea by Steve Saviano and he said it was fine (although he's worried about eventually winding up with "addEvenLaterCallback") but he said I should ask you (Nick) if you were okay with it.

R=nicksantos
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git-svn-id: 35241bd708fe29f1f6c7a4322d322e99ff93b95e@1811 0b95b8e8-c90f-11de-9d4f-f947ee5921c8

KgDesignes/closure-library,knutwalker/google-closure-library,KgDesignes/closure-library,knutwalker/google-closure-library,KgDesignes/closure-library