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This is an example of how to register a system web app as a system app.

Bug: 1032810
Change-Id: If1e6c67305a7baeef8467eab6580e86fdf75db8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1971039
Commit-Queue: Jessica Huang <jessing@google.com>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726697}