All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=922522

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=1fd6baa214fa3e844bbc9a0084efb5a0ffa06cea502316d6d41ea77f52f25443


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

linux-perf
mac-10_13_laptop_high_end-perf

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

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/1694aba2540000

😿 Pinpoint job stopped with an error.
https://pinpoint-dot-chromeperf.appspot.com/job/1694aba2540000

All of the runs failed. The most common error (20/20 runs) was:
ReadValueError: Could not find values matching: {'story': u'load:media:google_images', 'tir_label': u'load_media', 'histogram': u'cpu_time_percentage'}

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/16874e20540000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/16874e20540000

Revert "[heap] Remove bailout marking worklist." by ulan@chromium.org
https://chromium.googlesource.com/v8/v8/+/13e07389ff53633e613ac98fab62cc7265222425
cpu_time_percentage: 0.0748 → 0.08003 (+0.005227)

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

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