All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=677448

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgn_uToQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgn5zAuwkM


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

android-one

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8991947811888005104

=== PERF REGRESSION ===


=== 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 =====
Status: completed


===== SUSPECTED CL(s) =====
Subject : [heap] Move GC tracer scope for incremental marking step one level up.
Author  : ulan
Commit description:
  
BUG=

Review-Url: https://codereview.chromium.org/2600513002
Cr-Commit-Position: refs/heads/master@{#41926}
Commit  : da328981ff11d136f484afc0638e919a8c781c62
Date    : Thu Dec 22 16:14:09 2016


===== TESTED REVISIONS =====
Revision                       Mean     Std Dev  N   Good?
chromium@440494                4.5432   7.57459  30  good
chromium@440494,v8@0f12793f69  4.5394   7.36766  30  good
chromium@440494,v8@da328981ff  75.2468  365.961  30  bad    <--
chromium@440494,v8@f8f09ec50b  75.1456  379.72   30  bad
chromium@440495                79.1074  406.475  30  bad
chromium@440496                79.3657  409.42   30  bad
chromium@440497                79.6526  360.834  30  bad
chromium@440499                81.9747  367.563  30  bad
chromium@440503                58.8995  307.682  30  bad

Bisect job ran on: android_one_perf_bisect
Bug ID: 677448

Test Command: src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests v8.infinite_scroll_tbmv2
Test Metric: v8-gc-incremental-step_max/v8-gc-incremental-step_max
Relative Change: 1196.43%

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/android_one_perf_bisect/builds/1900
Job details: https://chromeperf.appspot.com/buildbucket_job_status/8991947811888005104


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5797310749999104

| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Tests>AutoBisect.  Thank you!

Working as intended, it is a change in accounting of incremental marking step.