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This CL incorporates new behavior into the wayland base client for testing udmabuf_create on the server side. If memfd_create succeeds, the client
allocates a memory region using memfd_create instead of the chrome
SharedMemoryRegion class. The returned buffer is page aligned, and sealed
with F_SEAL_SHRINK due to the requirements of udmabuf_create on the server
side.


TEST=autoninja -C out_atlas/Release/ wayland_simple_client then scp the
client to an atlas chromebook. To run add --use-dmabuf flag.
BUG=None

Change-Id: I27f6f04c1d577e172bbb68bd09718e6f0d6d65f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003267Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Commit-Queue: Paulo Warren <pwarren@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738575}