All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=774092

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=22c479a1bc3873cecb170f695f66e5412c9ff378a073172678a1b0d8f9cc5ff0


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

android-nexus5
android-nexus5X
android-nexus6
android-nexus7v2
android-webview-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965932468946162016

=== BISECT JOB RESULTS ===
Perf regression found but unable to narrow commit range

Build failures prevented the bisect from narrowing the range further.


Bisect Details
  Configuration: android_nexus6_perf_bisect
  Benchmark    : smoothness.key_silk_cases
  Metric       : mean_frame_time/http___jsfiddle.net_xLuvC_1_show_
  Change       : 22.39% | 26.5133333333 -> 32.4493333333

Suspected Commit Range
  2 commits in range
  https://chromium.googlesource.com/skia/+log/df071d78850d6cfcb6fb891316757e33574ee512..c7e66ea989006b6f21ccf4e4c33644a55b5455ec


Revision                             Result                   N
chromium@507597                      26.5133 +- 0.210136      6        good
chromium@507662                      26.5143 +- 0.478434      6        good
chromium@507662,skia@df071d7885      26.4523 +- 0.698266      6        good
chromium@507662,skia@32a6924162      ---                      ---      build failure
chromium@507662,skia@c7e66ea989      32.3002 +- 0.76385       6        bad
chromium@507662,skia@37387c80cc      32.147 +- 0.875326       6        bad
chromium@507662,skia@c4b015ad5f      32.4212 +- 0.719726      6        bad
chromium@507662,skia@df007e1a7a      32.2902 +- 1.10275       6        bad
chromium@507663                      32.5028 +- 0.671617      6        bad
chromium@507664                      32.4392 +- 0.461106      6        bad
chromium@507666                      32.1717 +- 0.79685       6        bad
chromium@507670                      32.3342 +- 0.91551       6        bad
chromium@507678                      32.2005 +- 0.926851      6        bad
chromium@507694                      32.1498 +- 0.95482       6        bad
chromium@507726                      32.4493 +- 1.03749       6        bad

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 --story-filter=http...jsfiddle.net.xLuvC.1.show. smoothness.key_silk_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8965932468946162016


For feedback, file a bug with component Speed>Bisection

Given the 2 CLs in the range I think this is 
https://chromium.googlesource.com/skia/+/c7e66ea989006b6f21ccf4e4c33644a55b5455ec

Which also caused some other regressions. Duping against  Issue 774090