Ensure the animation type is reset after PIP window gets minimized

When ARC PIP gets dismissed, the window state transitions from PIP
to MINIMIZED and the animation type is set FADE_IN_SLIDE_OUT for
this transition. This CL allows the animation type to be reset
properly after the window is slided out.

right animations are applied respectively.

Bug: 949006
Test: Dismissed PIP, Unminimized, and closed it and confirmed the
Change-Id: Ia0c9b99dc97dffad9c9d560ac56b880b1d2d4aed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1567560
Commit-Queue: Kazuki Takise <takise@chromium.org>
Auto-Submit: Kazuki Takise <takise@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652082}
3 files changed