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This is a reland of 91f3b4a4

Original change's description:
> media/gpu/test: Add BitstreamFileWriter for video_encode_accelerator_tests
> 
> This adds BitstreamFileWriter, which saves given bitstream in
> H264 AnnexB format for h264 and ivf format for vp8 and vp9. It
> enables saving the bitstream encoded by VideoEncodeAccelerator with
> --output_bitstream option in video_encode_accelerator_tests.
> 
> Bug: 1045825
> Test: video_encode_accelerator_tests --dump_bitstream on eve
> Change-Id: I78da9b53791599b9672c683afbe29b3f8cf8787a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2214870
> Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
> Reviewed-by: David Staessens <dstaessens@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#779157}

Bug: 1045825
Change-Id: Ic3df2b161c0bbe5db38446e2eb9452f354eed463
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2247951
Auto-Submit: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779615}