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This CL is a part of Wayland gpu/ui split effort, which fixes the
Ozone/Wayland and makes it functional when the gpu service is running
out of the browser process.

The patch does not bring any functionality changes, but rather
prepares Ozone/Wayland for a dmabuf based approach, which uses ozone/drm code,
to be landed in the upstream.

In particular, gbm_device.cc/h is moved into a common folder in the
ui/ozone/common/linux and renamed to gbm_device_linux.cc/h. What is more,
it is refactored in such a way that it can be used by both Wayland with
dmabuf approach and ozone/drm.

This is only compiled for wayland(downstream now) and drm backends, and
does not bring any additional load on other backends.

Bug: 820047
Change-Id: I9eb4da474eb24d6d32fe355ff37b6d0806672fde
Reviewed-on: https://chromium-review.googlesource.com/1071889
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562613}