GitLab

There are a few relevant histograms that I annotated with the field trial name, and I added a new AddPage histogram.



TEST=none

BUG=none
Review URL: http://codereview.chromium.org/8379009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111386 0039d316-1c4b-4281-b951-d872f2087c98