So we can run dEQP on the GL ES back end.

BUG=angleproject:1371

Change-Id: I7694d766f04997f9ba60ad0dd0bb4b30e714b4ae
Reviewed-on: https://chromium-review.googlesource.com/342843Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Frank Henigman <fjhenigman@chromium.org>