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Like the unit tests, but these can test more robust browser activity.

Bug: 784639
Change-Id: I65ef78d56143d65811a05e7b8a1088e2ce9c372e
Reviewed-on: https://chromium-review.googlesource.com/905688
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537830}