All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=787439

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=2d9762d099b9bab86f392e5ec73e8f599777e794a2f355e4153f712537461b3d


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

android-nexus7v2
android-webview-nexus5X
android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962311969965771488

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

Suspected Commit
  Author : Kouhei Ueno
  Commit : e1cfaee91ad08478fbd956fcd73d570032702397
  Date   : Thu Nov 09 08:23:01 2017
  Subject: Revert "Make script cache hits async"

Bisect Details
  Configuration: android_webview_arm64_aosp_perf_bisect
  Benchmark    : v8.browsing_mobile
  Metric       : total:500ms_window:renderer_eqt:v8_max/browse_media/browse_media_youtube
  Change       : 397.24% | 53.3639462342 -> 265.3485

Revision             Result                  N
chromium@515111      53.3639 +- 3.28661      6      good
chromium@515120      52.5051 +- 3.69434      6      good
chromium@515121      236.376 +- 168.169      6      bad       <--
chromium@515122      268.061 +- 12.2129      6      bad
chromium@515123      264.969 +- 16.4186      6      bad
chromium@515125      269.219 +- 24.1175      6      bad
chromium@515129      263.472 +- 10.2979      6      bad
chromium@515147      269.898 +- 16.6457      6      bad
chromium@515182      265.349 +- 28.6087      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-webview --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.media.youtube v8.browsing_mobile

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8962311969965771488


For feedback, file a bug with component Speed>Bisection