telemetry: Add initial silk cases page set.

R=dominikg@chromium.org,nduca@chromium.org
BUG=304298

Review URL: https://codereview.chromium.org/33743002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230521 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230521