Add try job status check on commit.
Add try job status check on commit.

It acts as an advisory presubmit check for now since the try server isn't that stable.

BUG=none
TEST=gcl commit warns the user when a pending change hasn't passed the try job.
Review URL: http://codereview.chromium.org/119295

git-svn-id: http://src.chromium.org/svn/trunk/src@17870 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 7c24731bd89d987f184b461f256a941dfc6962a8
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