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VideoDecoder outputs GpuMemoryBuffer which is not allowed to map
by GpuMemoryBuffer interface. This causes VideoFrameFileWriter
cannot save it to the disk. This CL resolves the issue by
extracting the dmabuf-fds wrapped by the GpuMemoryBuffer and
map them.

Bug: 1115112
Test: video_decode_accelerator_tests --output_frames=all --use_vd
Change-Id: Ib6328e81aa12bda49a39f155db7e2ce9573fa0d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463010
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821142}