All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=771190

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=f16b2fbdda3019b13c070683ec57dce5f289f898921433a77913bf1e183e5447


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

android-nexus7v2
android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966742995993760576

=== Auto-CCing suspected CL author ulan@chromium.org ===

Hi ulan@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 7c1b01154a460dec5da40a9c8d5ae4e44eea8e4e
  Date   : Fri Sep 29 11:38:50 2017
  Subject: [heap] Enable concurrent marking on all platforms.

Bisect Details
  Configuration: android_nexus7_perf_bisect
  Benchmark    : thread_times.key_silk_cases
  Metric       : thread_other_cpu_time_per_frame/http___wiltzius.github.io_shape-shifter_
  Change       : 48.34% | 0.38638100149 -> 0.573169103949

Revision                           Result                     N
chromium@505546                    0.386381 +- 0.0231377      6      good
chromium@505556                    0.388128 +- 0.0191461      6      good
chromium@505558                    0.398562 +- 0.0369759      6      good
chromium@505558,v8@5005a62fe0      0.389048 +- 0.0253895      6      good
chromium@505558,v8@7c1b01154a      0.613904 +- 0.0343567      6      bad       <--
chromium@505559                    0.585423 +- 0.0614658      6      bad
chromium@505561                    0.561316 +- 0.0446402      6      bad
chromium@505565                    0.573169 +- 0.058603       6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=http...wiltzius.github.io.shape.shifter. thread_times.key_silk_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8966742995993760576


For feedback, file a bug with component Speed>Bisection

 Issue 771551  has been merged into this issue.

 Issue 771549  has been merged into this issue.

 Issue 771576  has been merged into this issue.

 Issue 775865  has been merged into this issue.

The regressions here are expected. We move work to background cpus and do faster progress in garbage collection.