GitLab

This patch is just for setting up the interface. Actual code
to fire each event will come soon.

BUG=154243
TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/14148006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194551 0039d316-1c4b-4281-b951-d872f2087c98