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In order to do this, we will need to know whether or not a PWA is
installed for a given profile, without actually loading that profile.
The suggested mechanism for this is to check the for the presence of
a Extensions/app_id subdirectory of the profile path.

Add a profile_menu_items_ member to ExtensionAppShimHandler that
lists all profiles in the AvatarMenu.

Add a installed_profiles member to ExtensionAppShimHandler::AppState
that lists all profiles for which a given app is installed (this is
a subset of the profiles in ExtensionAppShimHandler::
profile_menu_items_).

Add a ExtensionAppShimHandler::Delegate::GetProfilesForAppAsync
method to do the aforementioned path check.

Update ExtensionAppShimHandler::UpdateAppProfileMenu to sort menu
items by |menu_index| and to send an empty list if just one profile
would have appeared in the menu.

Add tests. Restructure tests such that ExtensionAppShimHandler
takes its delegate as a constructor argument (instead of having it
be set-able).

R=dominickn
TBR=skuhne

Bug: 1001215
Change-Id: I10bb7128c6f775759f1d1f381000eb7b33960eb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864098Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708792}