All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=752522

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=aeb919f8eb896ed741fe14b9ed2bb9ab18db7e956d694764117d281ca4ecde50


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

chromium-rel-win10
chromium-rel-win7-gpu-nvidia
chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8972178336096700528

=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Michael Lippautz
  Commit : c56ae86ad852cd0b7af931e42f7ee29308b79574
  Date   : Wed Aug 02 14:02:56 2017
  Subject: Keep WorkerGlobalScope wrapper alive as long as its context is alive

Bisect Details
  Configuration: winx64nvidia_perf_bisect
  Benchmark    : system_health.memory_desktop
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:v8:heap:effective_size_avg/load_news/load_news_qq
  Change       : 12.44% | 119589546.667 -> 134460757.333

Revision             Result                    N
chromium@491314      119589547 +- 8979468      6      good
chromium@491339      122036224 +- 8388608      6      good
chromium@491351      118366208 +- 5190186      6      good
chromium@491357      120463360 +- 7985717      6      good
chromium@491360      118628352 +- 7732137      6      good
chromium@491362      121162411 +- 5962456      6      good
chromium@491363      136820053 +- 9221112      6      bad       <--
chromium@491412      134460757 +- 3431317      6      bad

Please refer to the following doc on diagnosing memory regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/memory-infra/memory_benchmarks.md

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=load.news.qq system_health.memory_desktop

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8972178336096700528


For feedback, file a bug with component Speed>Bisection