GpuMemoryBufferVideoFramePool tries to allocate a scanout buffer for video overlay/underlay. In DrmThread::CreateBuffer, if a scanout buffer cannot be created, it falls back to allocating a buffer without BO_USE_SCANOUT.

In this case, it should fall back gracefully, but on Chrome OS (kahlee), allocating the video frame buffer without scanout led to a CHECK in the gpu process.

To reproduce this, revert https://chromium-review.googlesource.com/c/chromium/src/+/884401