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relies on Extensions methods to wait for the web app to be installed,
or to check the web app launch url.

Not yet addressed: InstallBookmarkApp calls in ExtensionPolicyTest.
https://crbug.com/1055183

Bug: 1052722
Change-Id: I5b7f81b8fe3c778ce5adbe46d28da40e7a070986
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067784Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Maksim Ivanov <emaxx@chromium.org>
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743909}