All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=775316

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=eeb9def7915ea6ed3782a3e16dbd74e6278e112cec9ee983510fee2c97f4e526


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

chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-mac11-air
chromium-rel-mac12
chromium-rel-mac12-mini-8gb
chromium-rel-win7-gpu-ati
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965532273862220128

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

Suspected Commit
  Author : Brian Salomon
  Commit : 7f56d3d2d865a9fed44c420bd3b9497118b7ed26
  Date   : Mon Oct 09 20:24:04 2017
  Subject: Revert "Revert "Disable GL buffer mapping on TSAN/Mac.""

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : media.desktop
  Metric       : memory:chrome:all_processes:reported_by_chrome:gpu:effective_size_avg/video.html?src_crowd.ogg_type_audio
  Change       : 31.67% | 6621052.0 -> 8718204.0

Revision                             Result              N
chromium@507644                      6621052 +- 0.0      6      good
chromium@507660                      6621052 +- 0.0      6      good
chromium@507662                      6621052 +- 0.0      6      good
chromium@507662,skia@df007e1a7a      6621052 +- 0.0      6      good
chromium@507662,skia@c795a4c886      6621052 +- 0.0      6      good
chromium@507662,skia@7f56d3d2d8      8718204 +- 0.0      6      bad       <--
chromium@507662,skia@29380bdd56      8718204 +- 0.0      6      bad
chromium@507662,skia@3f98552933      8718204 +- 0.0      6      bad
chromium@507663                      8718204 +- 0.0      6      bad
chromium@507664                      8718204 +- 0.0      6      bad
chromium@507668                      8718204 +- 0.0      6      bad
chromium@507676                      8718204 +- 0.0      6      bad
chromium@507707                      8718204 +- 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.crowd.ogg.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/8965532273862220128


For feedback, file a bug with component Speed>Bisection