Telemetry: Add more tests to the top_25 page set.

BUG=158323
NOTRY=true


Review URL: https://chromiumcodereview.appspot.com/11280184

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@169765 0039d316-1c4b-4281-b951-d872f2087c98