Plumb the font hinting settings from render_text_pango.cc to SkPaint.

This also doesn't fix the font hinting settings, but is another link in
plumbing from the user settings to the actual rendering.

BUG=318395

Review URL: https://codereview.chromium.org/110583007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241749 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241749