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[macOS Capture] SBT: Improve IOSurface-less pixel buffer test coverage.

CL 2551665 fixed a bug relating to SampleBufferTransformer's fast path
not considering IOSurface-less pixel buffers and added test coverage
that the fast path always outputs a pixel buffer with an IOSurface.

However, in CL 2551665 these IOSurface-less pixel buffers are created
without content; CreateSampleBuffer is ignoring the RGB values. This
CL addresses that and improves the test coverage, but because we pass
all the tests, this CL won't have to be backmerged to M88. It's a
testing-only change.

This CL:
- Creates IOSuface-less pixel buffers in the specified color.
- Verifies that both the "pixel transfer" path and the "libyuv" path
  are able to scale IOSurface-less pixel buffers and that the color is
  correct.
- Verifies that regardless of technique we output an IOSurface-backed
  pixel buffer.

With this CL, all possible camera output formats are both supported and
well tested.

Bug: chromium:1148964
Change-Id: Ic016e3109de42d73a39b5a7e0a155b56c87e0cbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2553551Reviewed-by: Markus Handell <handellm@google.com>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830145}