These will need to set dirty bits for the program, and this is best 
done via the Context.

BUG=angleproject:747

Change-Id: I1379d2d4be0e94206c0aa7cb1546aa1a591f23ff
Reviewed-on: https://chromium-review.googlesource.com/529767Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>