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This CL enables V4L2VideoEncodeAccelerator to encode GpuMemoryBuffer based
VideoFrame. GpuMemoryBuffer is preferred to DMABUF on encoding because
GpumemoryBuffer interface support Map() and multiplatform support (e.g.
Android and Windows). V4L2VideoEncodeAccelerator still can encode DMABUF
based VideoFrame.

Bug: 1001413
Test: video_encode_accelerator_unittest on kevin with crrev.com/c/1808939
Change-Id: I1bc19d47bea88077cb778cb2c7c70618d22731a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808946
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697534}