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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}