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At the moment, we have zwp_linux_dmabuf support that we use
to create wl_buffers in the browser process based on passed dmabuf prime fds
from the GPU process.

However, there are plenty of systems that also support
EGL_EXT_image_dma_buf_import, but do not provide zwp_linux_dmabuf
protocol extension.

Instead, instead they use the wl_drm protocol. Thus,
import it to third_party protocols and utilize it in the
Ozone/Wayland implementation.

There are no functionality changes brought with this CL, but rather
it adds support for that protocol and uses it if zwp_linux_dmabuf
is not available.

If non is available, Chromium uses software compositing
(Chromium hosts gpu service in a separate process) or Wayland Egl
(in-process-gpu is passed and the gpu service is hosted in the browser
process).

Bug: 1008348
Change-Id: I06eddc68ef0ad0a897aeefa1f31677986e563eac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827001Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#703388}