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This CL enables FakeVideoCaptureDevice and FileVideoCaptureDevice
to provide fake camera frames backed by GpuMemoryBuffer.

Bug: 982201, 1006613
Test: capture_unittests
Test: tast.DecodeAccelUsedVP8
Test: Manually with appr.tc and Hangouts Meet

Change-Id: I495d1cf11f4f4b9181842c373023b907d7f77f25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863055
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706829}