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There was a wrong gn arg in the ozone/linux config, which
had been removed (ozone_platform = "X11").

Also, ozone_platform_headless has been added to be able to run
tests with headless backend.

Bug: 700309
Change-Id: I66ba98ab7cc55631a0af1ddfb8a06e38e4b7eaf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1735463Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#684024}