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The current minimization animation, which is triggered by going to
home screen from in-app shelf, uses the bounds of the icon
which corresponds to the active window to be minimized as the
animation's target bounds. However, hotseat's bounds change due to
entering the home screen. As a result, the target bounds are not the
final bounds.

This CL fixes the issue by providing an interface to calculate
the icon's bounds according to the hotseat's target bounds instead
of the actual bounds.

There are four ways to show the home screen from in-app shelf:
(1) Press the home button.
(2) Gesture fling up on the hotseat.
(3) Back gesture.
(4) Tap on the shelf icon.

In case (1), hotseat's target bounds have been set before starting
the window scaling animation. In other cases, target bounds are not
set yet. Thanks to https://crrev.com/c/1999443, case 3 and case 4 are
solved. The last one, case 2, will be fixed in the following CL.

Bug: 1030819
Change-Id: I63cafabe6527aba49e9f98e338f9f248284e1d0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1996268
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732416}