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This CL makes sure that Picture-in-Picture window controls bounds are
not updated too rapidly, causing UX/UI issues. When a Media Session
change happens, controls visibility will still be updated as before but
bounds now will be updated all at once after a small delay.

Bug: 960164
Change-Id: I6a66e4db76d8aeb2d56277fd46d51db1263e6c65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598334Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#660924}