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Creating hotseat bounds animation which is triggered by hotseat state
change requires the hotseat state transition type. However, the current
method to calculate the transition type in HotseatWidget::SetState is
hard to reset the stored transition type after the transition completes.
In this CL, a scoped class is introduced to set/reset the transition
type stored in HotseatWidget. Note that the only place to set the
hotseat state then update the hotseat bounds is
ShelfLayoutManager::SetState(). It ensures the correctness of this CL.

Bug: 1024911
Change-Id: Ie68d182dbf105c4376898e7c0269a620194e6e6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2235980Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776238}