Add robohornet as an animation test
Robohornet's main page is a good animation stress test (even without running the robohornet test).
Rather than hacking in a scrolling interaction, I decided to make a wait interaction since that's more appropriate for animation related smoothness tests.
It no longer made sense for the section in the page sets to be labeled "scrolling" any longer -- "smoothness" is more appropriate. I've made this change as well.
BUG=None
Review URL: https://chromiumcodereview.appspot.com/
11734036
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175188 0039d316-1c4b-4281-b951-d872f2087c98