Update the bubble bounds upon window transform.

The standard bubble implementation has this code[1] to deal with
transform animation. The custom bubble should have the same.

I'll refactor + reuse this, add test in ash in a follow up CL.

[1] https://source.chromium.org/chromium/chromium/src/+/main:ui/views/bubble/bubble_dialog_delegate_view.cc;drc=b09eb612cb13398916d28342210018c609e887c6;l=323

Bug: 409493343
Change-Id: I216cfde441f517b1a8255cf441f166aa49aefb32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6477147
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1449641}