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This CL follows up on the previous by updating the uses of BGRA_1010102
(which used to be BRGX_1010102) in resource_format_utils.cc and
gl_image_io_surface.mm, basically allowing for its correct usage now
that the gymnastics of pretending that the alpha format is opaque.

Of note here is the CGLTexImageIOSurface2D we use for these types:
https://github.com/phracker/MacOSX-SDKs/blob/HEAD/MacOSX10.12.sdk/System/Library/Frameworks/OpenGL.framework/Versions/A/Headers/CGLIOSurface.h#L102

TEST=display and gl_unittests passing and
http://crosvideo.appspot.com/?codec=vp9.2_30&loop=true&mute=true
reproducing correctly on Mac.

TBR=kbr@ for gpu/command_buffer/service/feature_info.cc (comment fix)

Bug: 949260
Change-Id: I8a422192a27833846482d14a1106d7d662ab9bb9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2072780
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747097}