This one was in a different blit function.

BUG=angleproject:1246

Change-Id: Ib571c10ddc30b3293f5c0d6bdb357b4cd3b52579
Reviewed-on: https://chromium-review.googlesource.com/362774Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>