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This is a simple check to allow us to be able to easily run a limit
study to understand the effectiveness of previews. By limit study, we
mean showing Previews on all page loads for a subset of the population.
The limit study will still utilize the CanApplyPreview logic (e.g.,
hints and blacklists).

Bug: 1031593
Change-Id: I4fd6aec779447615a0660f3d22167091441d4e12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954710
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722684}