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And wires it up for an example app (ash_shell_with_content).

BUG=none
TEST=hopefully covered by existing tests

Change-Id: I66893ebcbf53681a5fcd5e13c4d9cc87fd517cda
Reviewed-on: https://chromium-review.googlesource.com/1005567
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549893}