Moving WebKit's Linux font rendering settings lookup code to Chrome?

I'd like to move WebKit's code for looking up per-run-of-text Linux
font rendering settings, currently in
WebFontInfo::renderStyleForStrike(), to a spot where it can also be
used to look up rendering settings while drawing the Ash UI
(http://crbug.com/125235).  Chrome's
ui/gfx/font_render_params_linux.h, which I just added to consolidate
various bits of code that want the _default_ rendering settings, seems
like a reasonable place to put it.

Within WebKit, PlatformSupport::getRenderStyleForStrike() either:

a) calls WebFontInfo::renderStyleForStrike() directly if possible
b) uses WebSandboxSupport to IPC to the browser to call
WebFontInfo::renderStyleForStrike()

For a), I think that I'd instead want to expose something via
PlatformSupport that would be implemented in Chrome to call the code
in ui/gfx directly.  If this makes sense, any suggestions about how it
should be exposed?  I don't see any OS(UNIX) ifdefs under
Platform/chromium/public; it looks like the preferred approach is to
restrict interface differences to the linux/, win/, etc.
subdirectories.  Should I add a new WebFontSupport or similarly-named
object that just exposes this method on Linux, or is there a better
way to handle the no-sandbox case?

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