Warn when number of inflight build is too high.
Warn when number of inflight build is too high.

TEST=none
BUG=27143
Review URL: http://codereview.chromium.org/381005

git-svn-id: http://src.chromium.org/svn/trunk/src@31470 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8542c4514c1ccf17e639cfc16f19a50c0127b631
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