Fix race on creating the default typeface.

BUG=skia:1906
R=mtklein@google.com, reed@google.com

Review URL: https://codereview.chromium.org/113543005

git-svn-id: http://skia.googlecode.com/svn/trunk@12993 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed