Add a histogram to record when users use the reset-variation-state flag.

BUG=None
TEST=No user visible change.


Review URL: https://chromiumcodereview.appspot.com/11342015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@164910 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed