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AppServiceAppWindowCrostiniTracker is added to handle Crostini app
window special cases, e.g. CrostiniAppDisplay, Crostini shelf app id,
etc.

AppServiceAppWindowCrostiniHelper implements part of functions from
CrostiniAppWindowShelfController.

Update Crostini's LaunchApplication and CrostiniAppRestartView::Accept
to use AppServiceAppWindowCrostiniHelper.

BUG=1011235

Change-Id: If8f71b7b45e190431b1023fe9f1feab746f788f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1941539
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721283}