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This CL exposes AppService App publisher_id to Tast API. publisher_id
can be used to identify an App in the app publisher's subsystem. For
example, Andrdoid package name for ARC, Web app start url for Web Apps.

This is useful for tast tests wishing to interact with the App outside
of the App Service infrastructure.

Fixed: 1155337
Change-Id: I6719526a1141b312d1f8758d61b2ce716889c68f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580965Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835987}