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Add support for a manual WebAPK update flow. This is a *dev*
feature intended to help test changes to WebAPKs/manifests
without waiting for a long time period.

The buttons set a flag that schedules an update when
next launching the WebAPK. Once scheduled, the update will
occur sometime after the WebAPK is closed. This avoids the
need for refactoring or modifying the update path and
instead just requires plumbing a status message to the UI.

Bug: 918898
Change-Id: I7eb3203f30de95f4918ae64489be9c72e24ce8f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674164
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676451}