Enable use of distance fields via SkPaint flag.

Enable use of distance fields via SkPaint flag.

Now that distance field generation is fast enough to make it practical, this makes distances field fonts easily available to anyone who wants to try them out (i.e Chromium).

BUG=skia:2173
Committed: http://code.google.com/p/skia/source/detail?r=13741

[jvanverth1, 2014-03-10 20:30:46]

Updated to make it clear that the distance field flag is temporary.
Also implement missing 'set' function.

[reed1, 2014-03-10 20:32:26]

api lgtm

[bsalomon, 2014-03-10 20:43:46]

On 2014/03/10 20:32:26, reed1 wrote:
> api lgtm

lgtm

[jvanverth1, 2014-03-11 16:03:44]

The CQ bit was checked by jvanverth@google.com

[commit-bot: I haz the power, 2014-03-11 16:03:52]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/jvanverth@google.com/193163003/40001

[commit-bot: I haz the power, 2014-03-11 17:07:27]

Change committed as 13741