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This CL allows XR30 for GpuMemoryBufferVideoFramePool output
format in Linux (not CrOs yet), and teaches GLImageMemory how
to manipulate this format.

Unittests are extended, tested also with high bit depth
videos e.g.:
'http://crosvideo.appspot.com?codec=vp9.2&loop=true'
and media/test/data/...
- bear-320x180-hi10p-vp9.webm
- bear-320x180-hi10p.mp4 (this is an H.264 part 10, 10bpc)
- blackwhite_yuv420p_hi10p.mp4
- bear-320x180-hi12p-vp9.webm

Bug: 803975
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ie5fb3fa60036591fabdfcf774fcb0878b1ebca07
Reviewed-on: https://chromium-review.googlesource.com/881665
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533045}