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This CL teaches GpuMemoryBufferVideoFramePool to handle XR30
formats, when context capabilities' image_xr30 is enabled
and the incoming data is of 10 bit per component type.

This CL also enables the necessary checks in the gles2 and
GpuMemoryBuffer support to recongnise this format in Mac only
(other platforms coming soon).

Test 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

Also covered in e.g. content_browsertests'
 MediaColorTest.Yuv420pHighBitDepth
which would fail if the colors were inverted.

Bug: 797347
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;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: I8e73a7558d5506875d1547983d4e5e796a543aeb
Reviewed-on: https://chromium-review.googlesource.com/862326Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531293}