[cros] Added histograms for user image usage
R=altimofeev@chromium.org BUG=chromium-os:18916 TEST=Sign in as a new or existing user with different images chosen. Change picture to different ones. Check that each time the appropriate histogram is updated at chrome://histograms. Review URL: http://codereview.chromium.org/7590002 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96176 0039d316-1c4b-4281-b951-d872f2087c98
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