All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=900934

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=427b27a67e36cf66598e36a5104f15a8740db2bc7d3d20654848b549d3d1f8b8


Bot(s) for this bug's original alert(s):

Android Nexus6 WebView Perf

blink_perf.paint - Benchmark documentation link:
  https://bit.ly/blink-perf-benchmarks

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/16e5c523e40000

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/16e5c523e40000

pdr@, this may be your long awaited BGPT regression. Doesn't seem actionable yet, however.

I've split out blink_perf.paint / transform-changes to:
https://bugs.chromium.org/p/chromium/issues/detail?id=902411

I was planning on splitting out the rest of these, but they are also the same issue. This is almost certainly:
EnableGpuRasterizationViewportRestriction bot config
https://chromium.googlesource.com/chromium/src/+/924edd7aee62613bf0d3f51b4c4d00e63f5c104e

@Eric, I think this is likely wontfix.