All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=770383

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=cb1ede1066ab6931de034edd871d954dd732f22e692393255cee10ddcd91842a


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

chromium-rel-win7-gpu-intel

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8967079174709934816

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

Hi beccahughes@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 : Becca Hughes
  Commit : 46fb5c855a8622fe73a5c8000b7370407b9122af
  Date   : Thu Sep 28 11:09:34 2017
  Subject: Media Controls: Replace painter with CSS (timeline).

Bisect Details
  Configuration: winx64intel_perf_bisect
  Benchmark    : media.tough_video_cases_tbmv2
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:blink_gc:effective_size_avg/memory:chrome:renderer_processes:reported_by_chrome:blink_gc:effective_size_avg
  Change       : 1.53% | 1717917.01333 -> 1744131.41333

Revision             Result                  N
chromium@504928      1717917 +- 9572.15      6      good
chromium@504953      1720538 +- 8825.08      6      good
chromium@504960      1721412 +- 16017.3      6      good
chromium@504963      1722286 +- 12295.6      6      good
chromium@504965      1725781 +- 8825.08      6      good
chromium@504966      1746753 +- 8825.08      6      bad       <--
chromium@504978      1744131 +- 9572.15      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 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/8967079174709934816


For feedback, file a bug with component Speed>Bisection

Issue 771317 has been merged into this issue.