All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=885044

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=085b7939db42b98b7100c7b7e677645af330b5816cea0aeed0d420ace2aed280


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

Android Nexus5 Perf
Android Nexus5X WebView Perf
Android Nexus6 WebView Perf
Win 7 Nvidia GPU Perf
Win 7 Perf
mac-10_12_laptop_low_end-perf
mac-10_13_laptop_high_end-perf

system_health.memory_mobile - Benchmark documentation link:
  https://bit.ly/system-health-benchmarks

system_health.memory_desktop - Benchmark documentation link:
  https://bit.ly/system-health-benchmarks

memory.top_10_mobile - Benchmark documentation link:
  None

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/13eb15bb640000

📍 Found significant differences after each of 2 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/13eb15bb640000

Surface Synchronization: Enable by default on Android by ericrk@chromium.org
https://chromium.googlesource.com/chromium/src/+/5479bee2ba20c0527e19137d8056b539d30125d1
9.4e+06 → No values

Disable Surface Synchronization on Webview by nednguyen@google.com
https://chromium.googlesource.com/chromium/src/+/a91df97e284e497ecf1222b4ada5af66306718a5
No values → 1.023e+07

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

Benchmark documentation link:
  https://bit.ly/system-health-benchmarks

 Issue 885042  has been merged into this issue.

This is not Surface sync, but instead is some other regression that snuck in while our results were broken. Will run a manual bisect.