Require sRGB write control for sRGB support. Add flag to GrPaint to suppress linear -> sRGB conversion on write. Use that to fix YUV conversion, which directly produces sRGB data. (Technically, it produces data in whatever the color space of the JPEG might be).

BUG=skia:
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Review URL: https://codereview.chromium.org/1830303002
12 files changed