https://uma.googleplex.com/p/chrome/timeline_v2/?sid=c9d63a46185ce047274b680c10636adb shows almost 100% regression on 50th percentile.

This is the regression range:
https://chromium.googlesource.com/chromium/src/+log/69.0.3457.0..69.0.3461.0?pretty=fuller&n=10000

More info:
-The regression affects lower percentiles only: I could see it on 25th, 50th, and 75th, but not on 95th.
-The metrics have not regressed on Android.
-The end to end scroll latency metrics are not impacted since Event.Latency.*.GpuSwap2 is a small fraction of the end to end metric.