this commit[0] might be what's referenced, and this[1] looks to be the test that Google runs (not sure if this is ran in CI, or only done anecdotally for when performance tests[2] show issues).

0: https://github.com/chromium/chromium/commit/208f274e4bcb5174...

1: https://chromium.googlesource.com/chromiumos/third_party/aut...

2: https://chromeperf.appspot.com/

Here is an example bug that had an unobvious cause (they just reverted the diff out in the end!):

https://bugs.chromium.org/p/chromium/issues/detail?id=520952

Bisect job status: Completed Bisect job ran on: android_nexus9_perf_bisect

===== BISECT JOB RESULTS ===== Status: Positive: Reproduced a change.

Test Command: tools/perf/run_benchmark -v --browser=android-chromium --output-format=buildbot --also-run-disabled-tests power.android_acceptance Test Metric: energy_consumption_mwh/energy_consumption_mwh Relative Change: 150.95% (+/-1.88%) Estimated Confidence: 99.90% Retested CL with revert: No

Pretty graphs now deleted.