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On the failed case of ui.HotseatAnimation tast test, app-list
is actually animating, and HomeLauncherStateWaiter is not used,
thus the callback is never invoked.

This CL cleans up the condition for HomeLauncherStateWaiter to
be used.

Note: this CL also adds a test case of autotestPrivate API.
However, this new test case does NOT reproduce the reported
problem -- it passes even without the change of
autotest_private_api_utils.cc. I couldn't find the way to
reproduce the reported problem within browser_tests. Still,
I think it's better to have a basic test case of
waitForLauncherState in tablet-mode, as its internal code
path is significantly different.

Bug: 1167225
Test: ui.HotseatAnimation.non_overflow_shelf tast test
Change-Id: I33352f216af795e20d651942ce219feb5c4f052a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640928
Commit-Queue: Jun Mukai <mukai@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846277}