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This serves as documentation on how to trigger a stale preview page and
checks for the regression in the attached bug.

Bug: 898570
Change-Id: I17475d4e0f39021507f2365836e6d7955c4f7fd1
Reviewed-on: https://chromium-review.googlesource.com/c/1313744Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604776}