Unify desktop Linux and Chrome OS font rendering params.
Use the same path to get font rendering settings on desktop
Linux and Chrome OS: query the LinuxFontDelegate if it's set
and then query Fontconfig.
Also make the LinuxFontDelegate interface return a
PangoFontDescription directly (as opposed to an opaque
string that's actually a stringified PangoFontDescription)
and make it return a cached FontRenderParams struct instead
of exposing separate methods for looking up individual
properties.
Finally, add a missing build dependency on ui_test_pak, which
is needed to get the default font resource when running
gfx_unittests on Chrome OS.
BUG=125235,393067
Review URL: https://codereview.chromium.org/
400193004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284255 0039d316-1c4b-4281-b951-d872f2087c98