Dismiss the bottom sheet when the orientation changes.

This is an alternate approach which relies on changes to the
WindowAndroid object instead of using the configuration change
method.

Due to an odd interaction between elements and chrome and the bottom
sheet, when the phone is rotated while a chrome feed bottom sheet
menu is up, the bottom sheet menu redraws empty.  To prevent that,
we will dismiss the bottom sheet whenever we get a configuration
change (such as a rotation) while the menu is up.

This workaround will dismiss the bottom sheet for any configuration
change, such as the keyboard being brought up, rotation, or screen
size or layout changes, which is slight overkill.  A better long
term solution would be to detect the initial orientation and
remember it, and only dismiss the dialog if the orientation itself
changes.  Another possible long term solution is to debug the
interaction that makes the menu paint empty, and fix that.

We have tentative approval from UX for this change.

We want to get this change into M90, so if approved, we intend
to cherry-pick it into the M90 branch.

Bug: 1187456
Change-Id: Idbe971bcf7eac6812cea9dc52941f7ce1ef48834
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2775201


Commit-Queue: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Dan H <harringtond@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#864963}