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V4L2VEA creates V4L2IP for a pixel format conversion. The
destination buffer is either memory-based VideoFrame or
Dmabuf-backed VideoFrame created by V4L2IP internally.

This adds GpuMemoryBuffer-based VideoFrame for the
destination buffer. The GpuMemoryBuffer is created by
V4L2VEA.

Bug: 1033799
Test: VEA test on kukui
Change-Id: I2284301e6d1ae9334d1b38637b62b0d04d808f7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022562
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740584}