GitLab

Use an explicit shared image allocation for the intermediate texture
that is used in both the source and destination GL contexts.

Bug: 882547
Change-Id: Ibd37bb16a1a43860976c9b35feadd576e099df4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1633530
Auto-Submit: Antoine Labour <piman@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664539}