All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=748078

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=2be0d7d5834fb89d87a711bb96a25de64a5801ceb0fb4775ab5f84a7f2d62e42


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

chromium-rel-mac12
chromium-rel-win10
chromium-rel-win7-gpu-ati

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8973169599912876464

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

Suspected Commit
  Author : Ross McIlroy
  Commit : 3e19d72377f985545fc4966dcfad76442280d68f
  Date   : Tue Jul 18 09:43:19 2017
  Subject: [Compiler] Move creation of SharedFunctionInfo later in compile.

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : media.tough_video_cases_tbmv2
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:peak_size_avg/video.html?src_crowd1080_vp9.webm
  Change       : 2.79% | 293536.0 -> 301728.0

Revision                           Result             N
chromium@487423                    293536 +- 0.0      6      good
chromium@487447                    293536 +- 0.0      6      good
chromium@487450                    293536 +- 0.0      6      good
chromium@487452                    293536 +- 0.0      6      good
chromium@487452,v8@2b5a36d571      293536 +- 0.0      6      good
chromium@487452,v8@3e19d72377      301728 +- 0.0      6      bad       <--
chromium@487452,v8@b56b94bebc      301728 +- 0.0      6      bad
chromium@487453                    301728 +- 0.0      6      bad
chromium@487459                    301728 +- 0.0      6      bad
chromium@487470                    301728 +- 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.crowd1080.vp9.webm 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/8973169599912876464


For feedback, file a bug with component Speed>Bisection