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ForceKeyFrame requested after the frames are released specified
times and checks if the first bitstream returned by
VideoEncodeAccelerator is keyframe after requested.
However, releasing frames and producing bitstreams are
asynchronous. This check is wrong. This CL corrects the fix
by seeing if the keyframe exists in a few produced bitstreams
after requested rather than the first bitstream.

Bug: b:176252185
Test: video_encode_accelerator_tests on grunt
Change-Id: I442635a3c1ffefd4fcade9abdd81e74205e931be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2614527Reviewed-by: David Staessens <dstaessens@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842443}