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LibyuvIP supports Dmabuf-backed VideoFrame on input. This adds
the Dmabuf-backed VideoFrame support on output.
Both input and output VideoFrames are mapped every Process() by
using VideoFrameMapper if their storage types are DMABUF.

Bug: 1033799
Test: image_processor_test on kevin
Change-Id: I30f5e48027081a6ff7c6debc747543678586c776
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016526
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735775}