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This uses GpuMemoryBufferVideoFramePool to import software video
frames.

Bug: 1142754
Change-Id: Ic1a7849ca7a833ecf255892ba962ce2207b57546
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2603036Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jie A Chen <jie.a.chen@intel.com>
Cr-Commit-Position: refs/heads/master@{#841423}