add play control
add play control

Review URL: http://codereview.chromium.org/2813006

git-svn-id: http://src.chromium.org/svn/trunk/src@50041 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: bb0f0e96c4acbcf7b1be0d5a54908ecad0ffeb93
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