[Document PiP] Prevent launching pip window if PiP is not enabled

This change prevents attempting to create a new Document
Picture-in-Picture window if the Picture-in-Picture permission is not
enabled, or if going into pinned layer is not supported.

Bug: b:479138379
Change-Id: Ib3529ca01ba9d0c454ef16a11c07ce9934ee2f83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7557632
Commit-Queue: Abdelrahman Eed <abdoeed@google.com>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1582439}


CrOS-Libchrome-Original-Commit: dbba78f1f5339496e20ac5c0c07e68d16a20a334