Right now in V4L2VideoDecodeAccelerator, when it needs ImageProcessor, it calls the original Process() interface. We plan to deprecate the original interface (see crbug.com/907767). For the case ImageProcessor runs OutputMode::IMPORT mode, i.e. V4L2VideoDecodeAccelerator's output buffers are imported from its client, it should be as simple as wrapping output buffer's DMAbuf FDs into a new VideoFrame. And then use it as output_frame to call ImageProcessor::Process(input_frame, output_frame, cb).