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VideoFrameValidator validates frames by comparing with expected md5sum. The
validation is appropriate for deterministic image/video processing like video
decoding and format conversion among YUVs. There are various non-deterministic
image/video processing like frame scaling. So that VideoFrameValidator can
verify resulted frames in such cases, this enables VideoFrameValidator to
validate by comparing each byte of a given buffer with one of an expected
buffer.

Bug: 917951
Test: image_processor_test on atlas (pass) and eve (fail due to b/141724493)
Change-Id: I19dac5df329d9c838edc184dedf2582cd72beead
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866114
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710226}