All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=776751

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=b15ab22b93adee4877f504fbb686b0a3d36a737583d1a9741bcf42d6615bc02b


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

android-nexus5X
android-webview-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965206462834401520

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

Suspected Commit
  Author : Hans Wennborg
  Commit : 8316001e3f423f6ca2e7a9a7258c22944d16ae13
  Date   : Fri Oct 13 20:32:51 2017
  Subject: Roll Clang 313786:315613

Bisect Details
  Configuration: android_nexus5X_perf_bisect
  Benchmark    : blink_perf.image_decoder
  Metric       : decode-lossless-webp/decode-lossless-webp
  Change       : 6.86% | 374.441375 -> 400.109333333

Revision             Result                  N
chromium@508734      374.441 +- 12.8447      6      good
chromium@508792      379.707 +- 7.87285      6      good
chromium@508800      375.99 +- 6.88769       6      good
chromium@508802      377.153 +- 8.00334      6      good
chromium@508803      375.847 +- 5.38739      6      good
chromium@508804      394.543 +- 1.85036      6      bad       <--
chromium@508807      393.592 +- 8.59995      6      bad
chromium@508821      394.001 +- 3.80529      6      bad
chromium@508849      400.109 +- 5.48418      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/8965206462834401520


For feedback, file a bug with component Speed>Bisection