All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=760630

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=1dcc54a9f32b56fcf85ada764463fa78872398bc68c5b21324aa5257ecbbc026


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

android-one
chromium-rel-win10
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win7-x64-dual
chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8969816035173084144

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

Suspected Commit
  Author : Jakob Gruber
  Commit : 3168a963ff3a85c49f4e0ef9c4e93938c22d07e6
  Date   : Mon Aug 28 11:02:27 2017
  Subject: Revert "[csa] Refactor large-object handling in string allocation"

Bisect Details
  Configuration: win_x64_perf_bisect
  Benchmark    : media.tough_video_cases_tbmv2
  Metric       : memory:chrome:all_processes:reported_by_chrome:v8:effective_size_avg/video.html?src_tulip2.vp9.webm_background
  Change       : 10.22% | 5132288.0 -> 5656576.0

Revision                           Result              N
chromium@497830                    5132288 +- 0.0      6      good
chromium@497843                    5132288 +- 0.0      6      good
chromium@497845                    5132288 +- 0.0      6      good
chromium@497845,v8@9b15760286      5132288 +- 0.0      6      good
chromium@497845,v8@06753c64eb      5132288 +- 0.0      6      good
chromium@497845,v8@5bd5fd45c2      5132288 +- 0.0      6      good
chromium@497845,v8@837b801666      5132288 +- 0.0      6      good
chromium@497845,v8@3168a963ff      5656576 +- 0.0      6      bad       <--
chromium@497845,v8@c65792128c      5656576 +- 0.0      6      bad
chromium@497846                    5656576 +- 0.0      6      bad
chromium@497847                    5656576 +- 0.0      6      bad
chromium@497850                    5656576 +- 0.0      6      bad
chromium@497856                    5656576 +- 0.0      6      bad
chromium@497882                    5656576 +- 0.0      6      bad
chromium@497933                    5656576 +- 0.0      6      bad

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=video.html.src.tulip2.vp9.webm.background media.tough_video_cases_tbmv2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8969816035173084144


For feedback, file a bug with component Speed>Bisection