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This is for GLImageMemory's optimization path.

BUG=1087047
TEST=manual
R=kbr@chromium.org,khushalsagar@chromium.org

Change-Id: I82d3ceeac36644f95e3a52b2a943c4ecaeb651d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2226926Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774927}