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This will be used in the chrome.management.installWebApp API to verify
that the extension calling installWebApp owns the web app to be
installed.

Bug: 944397
Change-Id: I95ee4819ff8b9f342736c9d81b20f547d63f34d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1549300
Commit-Queue: Ben Wells <benwells@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649338}