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This is part of a larger project to measure page load times starting
at user input. One blocker for this is understanding how the
beforeunload dialog might affect this metric.

Bug: 750639
Change-Id: I7aef267a52353a6852dd82bad6c6c74a6fb82e51
Reviewed-on: https://chromium-review.googlesource.com/1162673
Commit-Queue: Annie Sullivan <sullivan@chromium.org>
Reviewed-by: Shubhie Panicker <panicker@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582992}