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This can be tested and enabled in conjunction with other features and
experiments for users in the future.

Default behavior is completely unchanged, and unit test thoroughly
tests new behavior.


Bug: 1009290
Change-Id: I57076270b2272831376c9b5ee787d9eecfa8d28f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1861914Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Rob Schonberger <robsc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706156}