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Add a Mojo service to RenderProcessHost for renderers being able to
connect to the FontUniqueNameLookup implementation on Android when the
feature is enabled. Preparation for Blink performing font-face { src:
local() } lookups correctly.

I have not found a good way to test this service on its own. Instead, I
aim to test font lookup through a browsertest once the font lookup is
hooked up in Blink. This would test the chain end to end. The
FontUniqueNameLookup implementation itself is tested extensively with
unit tests.

Bug: 868366
Change-Id: Ie4f4cca88d6e98efdecfee04221cdb11d5b3c302
Reviewed-on: https://chromium-review.googlesource.com/1152970Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580122}