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These are setup to have almost no cpu-time noise. There is
always only one frame source, and we either scroll 4 times
or wait for 10 seconds worth of frames.

Since these are jsbin pages, I've added a '?' label to give
the URL more meaning.

BUG=None

Review URL: https://codereview.chromium.org/250813002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269674 0039d316-1c4b-4281-b951-d872f2087c98