Ensure content::CanvasCaptureHandler use YUV color space for YUV frames

content::CanvasCaptureHandler specifies a gfx::ColorSpace to for the
resulting media::VideoFrame based on the input SkImage's SkColorSpace.

The input SkImage's SkColorSpace is an RGB space, but the actual data
passed to the media::VideoFrame is a YUV space.

Add a helper function, GetImageYUVColorSpace, to append the appropriate
those of REC709 or REC601). For the moment, specify no color space.

gfx: :ColorSpace::MatrixID and gfx::ColorSpace::RangeID (probably either
Change-Id: Icc8dee1bf1041b085ebd7c6205b3134548598984
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1531236
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642588}
3 files changed