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This is basically the iOS version of
https://chromium-review.googlesource.com/c/600309.
It'll make manual testing of the feature much easier.

Bug: 690467
Change-Id: I46656106f42821346bb323c655296e63e4ddd2b1
Reviewed-on: https://chromium-review.googlesource.com/602129Reviewed-by: Rohit Rao (ping after 24h) <rohitrao@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492020}