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Needed to debug unexplained behavior seen in browser controls that
don't reproduce in a local Chrome build.

Bug: 861618
Change-Id: I9a6769cd47a3329313628bd714039ec532fc3d94
Reviewed-on: https://chromium-review.googlesource.com/c/1351272Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610963}