Using json based tree status check.
Using json based tree status check.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/3116046

git-svn-id: http://src.chromium.org/svn/trunk/src@57444 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 86a7ed39c25ff08ac18888fa336fb9138518a55d
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser