CHROMIUM: virtwl: add dmabuf vfd support

This change supports the new dmabuf VFD type, which provides zero-copy
graphics output.

TEST=use linux_dmabuf protocol in sommelier
BUG=chromium:837209

Change-Id: Icdc1f7bca07be3766b123074d5f47311262fcfcd
Signed-off-by: David Reveman <reveman@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1030032
Reviewed-by: Zach Reizner <zachr@chromium.org>
3 files changed