Add field trial support to base on the Mac Review URL: http://codereview.chromium.org/7927
Add field trial support to base on the Mac
Review URL: http://codereview.chromium.org/7927

git-svn-id: http://src.chromium.org/svn/trunk/src@3830 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 25a18fdeb53de12f671466e35d51ac99fc9844a5
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