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If a page requires touch scrolling, we currently report a failure if the browser
doesn't support touch. This means that no average numbers will be reported on the
dashboard.
Instead of failing, we could skip the page and show a warning message to make the
user aware of that.

BUG=355661

Review URL: https://codereview.chromium.org/230373005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263014 0039d316-1c4b-4281-b951-d872f2087c98