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Provide a new subclass for font unique name lookup for Linux. Connect
via WebSandboxSupport to FontLoader which provides the out of process
fontconfig calls for us. Tested by content_browsertests with a DevTools
based test checking used fonts. This test was previously active on
Android and is enabled for Linux in this CL.

Bug: 880832
Change-Id: I04d72fc1cfcfa55a01a9877ac8a3a45dbff38771
Reviewed-on: https://chromium-review.googlesource.com/1206337
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589482}