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When capturing frames using the Page.screencast CDP API, the colors are
a little off.
It's hard to see with the naked eye, but using a color picker, you can
see a difference between colors in those frames and colors in similar
images taken with, e.g., the snip tool on windows.

The reason for this is that the DevTools Video Consumer used by CDP
does not specify any pixel format or color space when creating its
underlying FrameSinkVideoConsumer, and therefore the default values are
used: PIXEL_FORMAT_I420, COLOR_SPACE_HD_REC709

With this fix, we make it possible for the Page.screencast API to
specify the ARGB pixel format and REC709 color space, and this seems to
produce images with accurate colors.

Bug: 1141314
Change-Id: If06f5419c1feaebb3134a5d422769d8123f5518b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593354
Commit-Queue: Patrick Brosset <patrick.brosset@microsoft.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838137}