Skia representation of SharedImageBackingAHardwareBuffer.

Add a GL backed skia representation of
SharedImageBackingAHardwareBuffer. Update unit test.

Bug: 891060
Change-Id: Ib3b458615be13e7a536a12097e8452052b78a14f
Reviewed-on: https://chromium-review.googlesource.com/c/1330205
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: vikas soni <vikassoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607760}
5 files changed