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This enum is used when launching apps from the Shelf instead of the
currently used ash::ShelfLaunchSource::LAUNCH_FROM_UNKNOWN.

This not only makes the source of the app launch more clear, but
it helps make the behavior of code that examines the app launch
source clearer.

Bug: 900261
Change-Id: I8e7d8bdf5122621bf177cb1acb429445ed97a9c7
Reviewed-on: https://chromium-review.googlesource.com/c/1460106
Commit-Queue: Danan S <danan@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630518}