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A new test suite for the Preview Tab.

Also adds a helper for FirstRunFlow.
Using the helper in existing tests will be done separately.

BUG=952319

Change-Id: I756483ce549f9664012a24db8b62e1cdc43b9361
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2136282
Commit-Queue: Donn Denman <donnd@chromium.org>
Commit-Queue: Theresa  <twellington@chromium.org>
Auto-Submit: Donn Denman <donnd@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758265}