
This uses the ChromeOS OverlayScrollbar system pref to determine whether to always show scrollbars. A follow up CL will be created to update user prefs of overlay scrollbar for user session Low-Coverage-Reason: OTHER Gated behind feature flag. Bug: b:367789464 Change-Id: I88a546d44492d83378a7a47b746a884b56a791b2 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5939514 Reviewed-by: Evan Liu <evliu@google.com> Reviewed-by: Katie Dektar <katie@chromium.org> Reviewed-by: Scott Violet <sky@chromium.org> Reviewed-by: Peter Kasting <pkasting@chromium.org> Reviewed-by: Stefan Zager <szager@chromium.org> Commit-Queue: Zhengzheng Liu <zhzhliu@chromium.org> Cr-Commit-Position: refs/heads/main@{#1370955}