Register PaintLayer as client on backdrop-filter
A PaintLayer with a backdrop-filter applied wasn't added as a client to
the filter. This meant that it wouldn't get any notifications when the
contents of a filter was mutated.
Add client registration/unregistration to PaintLayer
(UpdateBackdropFilters and Destroy).
Bug: 359102842
Change-Id: Id664e680acb47860a931dc4b1b91142a19521950
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5824402
Commit-Queue: Philip Rogers pdr@chromium.org
Auto-Submit: Fredrik Söderquist fs@opera.com
Reviewed-by: Philip Rogers pdr@chromium.org
Cr-Commit-Position: refs/heads/main@{#1348693}