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This CL adds content_unittests for X11 with experimental
percentage set to 100% and different names for the one
running with headless and x11 backends.

Once we have weston in place, wayland will also be added.

Bug: 700309
Change-Id: I3ae0160028c4d94b8b81386240c824cf28483bb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1781438
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693103}