Fix effect tree for custom scroll corners
We override the effect node when painting scrollbars for a view
transition but erroneously missed doing it for custom scrollbars. Fix
that.
Fixed: 363544341
Change-Id: I13d2ad8b96df107e015c1e8caec1d081e77b65b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5913839
Commit-Queue: Khushal Sagar khushalsagar@chromium.org
Auto-Submit: Khushal Sagar khushalsagar@chromium.org
Reviewed-by: Vladimir Levin vmpstr@chromium.org
Cr-Commit-Position: refs/heads/main@{#1365167}