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While cleaning up to act on actually observed buffers in the WebM stream parser stream, I discovered that this test expectation isn't working:

https://source.chromium.org/chromium/chromium/src/+/master:media/muxers/webm_muxer_unittest.cc;l=645-658?q=webm_muxer_unittest.cc&ss=chromium%2Fchromium%2Fsrc.

After acting on actually passed buffers, it was found that the test fails. The reason is that in https://source.chromium.org/chromium/chromium/src/+/master:media/muxers/webm_muxer.h;l=155-157;bpv=1;bpt=1, last_xxx_ attributes are unset on first incoming buffers, leading the code to believe it's receiving non-monotonically increasing buffer timestamps.

Bug: chromium:1124735
Change-Id: Icf093fb94eef637ab17b8d38edd066313b5f7b48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390634
Commit-Queue: Markus Handell <handellm@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804636}