All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=788396

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=6ca1f404cc3912df6c793bb011302561f0754c146613cf4e3228f543735a3de9


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

android-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962038360363231088

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

Suspected Commit
  Author : Hans Wennborg
  Commit : 85023f0253e73844e0bdf00f134ddbeeae057aed
  Date   : Tue Nov 21 15:27:34 2017
  Subject: Roll clang 317263:318667.

Bisect Details
  Configuration: android_nexus5X_perf_bisect
  Benchmark    : blink_perf.image_decoder
  Metric       : decode-lossless-webp/decode-lossless-webp
  Change       : 5.12% | 375.142333333 -> 394.331875

Revision             Result                  N
chromium@518212      375.142 +- 1.668        6      good
chromium@518242      375.871 +- 2.16578      6      good
chromium@518257      374.265 +- 2.6322       6      good
chromium@518258      395.868 +- 4.03502      6      bad       <--
chromium@518259      394.679 +- 7.23717      6      bad
chromium@518261      396.817 +- 6.80831      6      bad
chromium@518264      394.609 +- 3.01235      6      bad
chromium@518271      394.332 +- 5.47417      6      bad

Please refer to the following doc on diagnosing blink_perf regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/speed/benchmark_harnesses/blink_perf.md

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests blink_perf.image_decoder

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8962038360363231088


For feedback, file a bug with component Speed>Bisection