All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=776857

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=c1730d90981b3e2bc69b88049d71e9cea293500baf8e2b67cb486389ff135b1a


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

chromium-rel-mac-retina

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965194582985094784

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

Suspected Commit
  Author : Eric Karl
  Commit : 840b7a60cc3c5f802ca271bd167e888e7494e8aa
  Date   : Wed Oct 18 22:39:08 2017
  Subject: [Re-Land] Use GPU Discardable in Image Decode Cache

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : media.desktop
  Metric       : memory:chrome:all_processes:reported_by_chrome:gpu:effective_size_avg/video.html?src_crowd1080.webm
  Change       : 13.40% | 7838264.0 -> 8888920.0

Revision             Result              N
chromium@509808      7838264 +- 0.0      6      good
chromium@509863      7838264 +- 0.0      6      good
chromium@509890      7838264 +- 0.0      6      good
chromium@509897      7838296 +- 0.0      6      good
chromium@509901      7838296 +- 0.0      6      good
chromium@509902      8888920 +- 0.0      6      bad       <--
chromium@509903      8888920 +- 0.0      6      bad
chromium@509904      8888920 +- 0.0      6      bad
chromium@509917      8888920 +- 0.0      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=video.html.src.crowd1080.webm media.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8965194582985094784


For feedback, file a bug with component Speed>Bisection