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This CL brings Weston to third_party. Weston is a reference Wayland
compositor that we are going to use as part of our ozone/Wayland effort.
To ensure rich and stable functionality, we need to run all the
available test suites with the Wayland backend natively.
Currently, the bot we use (linux-ozone-rel) runs X11 by default and is
not capable of running Wayland.

To be able to build weston within Chromium infrastructure, it
was migrated from meson to GN. It didn't make sense to migrate
everything, and, thus, I migrated only those bits that we need
to run tests with Weston successfully.

Bug: 1029241
Change-Id: I9a19eba26fae172c3f7f5d4be78d07042bc5c5c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1962128
Commit-Queue: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Darin Fisher <darin@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741079}