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Adds a version of KeyMobileSitesSmoothPageSet page set and
SmoothnessKeyMobileSites benchmark for use in the VR browser.

This re-uses all the same URLs/pages, but also adds a Vimeo page since
video is a large use case for VR.

Bug: 732830
Change-Id: I9146c1d2056527b8460b56a8b28f5da47ead1b23
Reviewed-on: https://chromium-review.googlesource.com/963042
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554835}