All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=846838

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=33a40cae720e99d66b84fe2e54a59f07c72260b7b237013988bee119b6446fc1


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

android-webview-nexus6

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/14637442240000

📍 Found significant differences after each of 4 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/14637442240000

Update the V8 version for Chromium branch 68. by hablich@chromium.org
https://chromium.googlesource.com/chromium/src/+/056a01b62ef49380a768126232e7c7ac7f417462

[root-scroller] Select effective by frame tree walk by bokan@chromium.org
https://chromium.googlesource.com/chromium/src/+/3583de23ea2e0cf11f626d63822181c6c36b2f64

Add RendererMemoryAblation features for renderer memory ablation experiment. by tasak@google.com
https://chromium.googlesource.com/chromium/src/+/91c27a2c3e92921c24ef18cffd8e190791ebb661

Fix SimpleTextPathLineLayout perf test so that layout doesn't get optimized away. by emilio@chromium.org
https://chromium.googlesource.com/chromium/src/+/ceb62691468baa50d951f625453f80f77e870c66

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

This is expected, my patch was fixing the test, which is expected to make it slower.