Use sequenced workers for the getting the system's font list.

This is necessary because on Linux we use Pango, which is not threadsafe (only newer versions are).


BUG=223772

Review URL: https://chromiumcodereview.appspot.com/13458002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192307 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed