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This CL is used to integrate Crostini's context menus for app list to
AppService:
https://cs.chromium.org/chromium/src/chrome/browser/ui/app_list/crostini/crostini_app_context_menu.cc?l=57
https://cs.chromium.org/chromium/src/chrome/browser/ui/app_list/crostini/crostini_app_context_menu.cc?l=34

BUG=1038487

Change-Id: Icde50aaf93cd961476f46a6652112005fe4a3ae4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002554Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732271}