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For issue 828317 we need an end to test for checking whether the correct
fonts have been selected for @font-face { src: local(<fontname>) }
rules. Since this cannot be reliable verified with web platform API, I
am using DevTools to connect to the content instance and retrieve
information about the selected fonts, just like in the style panel of
DevTools. The DevTools protocol communication is modeled after
content/browser/devtools/protocol/devtools_protocol_browsertest.cc

I appreciate feedback on whether I should duplicate this DevTools
communication code here, whether there is an easier way to achieve this,
or whether we should factor out the relevant parts of
content/browser/devtools/protocol/devtools_protocol_browsertest.cc into
a separate file that I can reuse here for the FontUniqueNameBrowserTest.

Bug: 874059
Change-Id: I4a2beeb81a3b5e4cec68cf196fcf0ebf29287d38
Reviewed-on: https://chromium-review.googlesource.com/1174540Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585916}