[perf] Follow-up for scrollbar styling.
[perf] Follow-up for scrollbar styling.

Follow-up for https://skia-review.googlesource.com/c/buildbot/+/301585

Change-Id: Ifafde7cd977a8abf7985517446b5ccfca10db23b
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/301817
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot