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The above capability allows creating shared images for scanout using the
GL backing factory. This was needed to support images with concurrent
read/write usage which is currently not supported by the AHB backing
factory.

R=vikassoni@chromium.org

Bug: 1019751
Change-Id: Iaf0300e049ac65fbe839b5fdf6d22db7a81d44f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147353
Commit-Queue: Khushal <khushalsagar@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Reviewed-by: vikas soni <vikassoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759837}