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This CL adds a switch to selectively enable GpuMemoryBuffer-based video
capture buffer. Devices supporting GMB-based video capture buffers can
achieve zero-copy for camera preview and reduce the power consumption on
various use cases significantly.

Design doc: go/cros-camera:dd:zero-copy

      /etc/chrome_dev.conf on Nocturne, and verify everything works.

Bug: 982201
Test: Manually add "--video-capture-use-gpu-memory-buffer" into
Change-Id: I178e00b0400e01f32ff8605de60c6dc2364dd384
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692155Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698872}