Reland "Track picture-in-picture occlusion for extension install dialog"

This is a reland of commit 9239872ef90b5994cf74135a259feacf2cdda221

The original CL failed because the extension install dialog, on Mac-12,
appears to always want to be centered.

The fix is to switch the order when forcing the widgets to overlap.
Now, when forcing an overlap, the bounds are set for the
Picture-in-Picture widget, instead of the extension install dialog
widget.

Original change's description:
> Track picture-in-picture occlusion for extension install dialog
>
> This change updates the extension install dialog to:
>   * Prevent user input when occluded by a picture-in-picture window
>   * Maintain input protection for a short period after the
>     picture-in-picture window is closed, through the use of the input
>     protector
>
> Bug: 40067402
> Change-Id: I0e0574688bb3c3c86bcc611b64e16ef624fff2e9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6735194
> Commit-Queue: Benjamin Keen <bkeen@google.com>
> Reviewed-by: Devlin Cronin <rdevlin.cronin@chromium.org>
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1490961}

Bug: 40067402
Change-Id: Iad65987cb439e2a5795e9e25524bbc97cc43a614
Include-Ci-Only-Tests: chromium.mac:Mac12 Tests|browser_tests
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6777898
Commit-Queue: Benjamin Keen <bkeen@google.com>
Reviewed-by: Devlin Cronin <rdevlin.cronin@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1491606}