This is a completion of Hans's WIP patch:
https://codereview.chromium.org/1176133002/

Makes it possible for us to style text in fn2 apps.

The title style in the toolbar doesn't look quite right
but as far as I can tell its the same color as the
old typography code produced.  Will need further investigation.

Fixes #213

R=abarth@chromium.org, jackson@google.com

Review URL: https://codereview.chromium.org/1178913003.