GitLab

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

Bug: 1033799
Test: image_processor_test on kevin
Change-Id: Idea3cf4b0fca5e53ed758a5f7a25440933090095
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2021784
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735776}