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This also adds extra scenarios.
* Resizing with overview on the other side.
* touch event

I also found the scenario that splitview controller can be
called recursively during shutdown, which is fixed by the change
in SplitViewController

Bug: None
Change-Id: I293ed17bba4961d338ac0f9a389f42f8f233d4ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637244
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666091}