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changes:
This CL makes ArcAppContextMenu showing Android app shortcuts in app
list context menu.
TODO list:
- Add ArcLauncherContextMenu integration for shelf item.
- Add LaunchAppShortcut support.
- Add UMA for measuring query & decode time.
- Add context menu metrics.
- UI adjustments when specs come.

video demo: go/appshortcuts-demo-1

Bug: 803291
Test: device test with android side change
Change-Id: I30f06d609eebc91c8d493af5bdb64360cdde002a
Reviewed-on: https://chromium-review.googlesource.com/1029412
Commit-Queue: Qiang Xu <warx@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555427}