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This CL adds extra command line options to the video_decode_accelerator_tests to
control the format and amount of video frames saved to disk when --output_frames
is specified:
--output_format: allows switching the file format between png and yuv.
--output_limit: allows putting a limit on the number of frames saved to disk.

TEST=ran new VDA tests on caroline

BUG=962354

Change-Id: Ifc0556986b28309b79ac7df9597154b85f08cc29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831728
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702728}