This allows us to skip 1/2 of the robust resource init check in
Context::setupDraw. The plan is to remove the other half in a follow-up
CL.

Most of the work of this CL was already handled. We just need to add
the right dirty object mask to the Context's draw dirty objects list.
We can mask out this check when robust resource is not enabled.

Bug: angleproject:2966
Change-Id: I97ec2497c95e5cdf52988e1ce85f7602206935f0
Reviewed-on: https://chromium-review.googlesource.com/c/1343140
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>