All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=775292

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=ff0af4bdb88c6bc14dd12b7afbfd30628b06289b5b573aaf80e07e345c9c058f


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

chromium-rel-win7-gpu-intel

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965532799664256080

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

Hi chcunningham@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 : Chris Cunningham
  Commit : 49e240c638f34c4a456fc2c80697161aeb23548c
  Date   : Wed Oct 11 01:57:28 2017
  Subject: Roll third_party/ffmpeg and update tests.

Bisect Details
  Configuration: winx64intel_perf_bisect
  Benchmark    : media.desktop
  Metric       : memory:chrome:all_processes:reported_by_chrome:malloc:effective_size_avg/video.html?src_tulip2.m4a_type_audio
  Change       : 0.86% | 15234920.7619 -> 15365417.2857

Revision             Result                   N
chromium@507838      15234921 +- 211680       21      good
chromium@507856      15219561 +- 142230       9       good
chromium@507859      15223174 +- 79079.2      6       good
chromium@507860      15223093 +- 147916       9       good
chromium@507861      15296279 +- 117913       14      bad       <--
chromium@507865      15282798 +- 142586       14      bad
chromium@507874      15298981 +- 133401       9       bad
chromium@507909      15365417 +- 846047       21      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.m4a.type.audio media.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8965532799664256080


For feedback, file a bug with component Speed>Bisection

Seems reasonable. Hopefully we're seeing a similar boost in time-perf for this small space-perf regression.