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Allows user to test go back functionality.

Bug: 1011977
Test: Run client, use back command.
Change-Id: Ib07e48dd9e07211a9b2b8cf2199d9bc65e4df98d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142571
Commit-Queue: Shawn Gallea <sagallea@google.com>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757908}