This covers a regression introduced with texture dirty bits.

BUG=angleproject:1387

Change-Id: Ic8112718c185298ef54ec5a6f6ed2cd519e010d6
Reviewed-on: https://chromium-review.googlesource.com/653586Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>