All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=727621

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg-pnbswkM


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

android-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8978177730091283792

=== BISECT JOB RESULTS ===
Bisect failed for unknown reasons

Please contact the team (see below) and report the error.


Bisect Details
  Configuration: android_nexus5X_perf_bisect
  Benchmark    : thread_times.key_silk_cases
  Metric       : thread_browser_cpu_time_per_frame/thread_browser_cpu_time_per_frame


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 thread_times.key_silk_cases

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8978177730091283792

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5191119727493120


| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Speed>Bisection.  Thank you!

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8978174551131704144

=== BISECT JOB RESULTS ===
Bisect failed for unknown reasons

Please contact the team (see below) and report the error.


Bisect Details
  Configuration: android_nexus5X_perf_bisect
  Benchmark    : thread_times.key_silk_cases
  Metric       : thread_browser_cpu_time_per_frame/thread_browser_cpu_time_per_frame


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 thread_times.key_silk_cases

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8978174551131704144

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5191119727493120


| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Speed>Bisection.  Thank you!

Bisect failed for unknown reasons

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8976996240771385776

=== Auto-CCing suspected CL author fsamuel@chromium.org ===

Hi fsamuel@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


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

Suspected Commit
  Author : fsamuel
  Commit : b520968f4ac40fb89ce25329134b388ca42cca12
  Date   : Thu May 25 03:10:42 2017
  Subject: cc::SurfaceDependencyTracker should not crash when a Display goes away

Bisect Details
  Configuration: android_nexus5X_perf_bisect
  Benchmark    : thread_times.key_silk_cases
  Metric       : thread_browser_cpu_time_per_frame/thread_browser_cpu_time_per_frame
  Change       : 6.17% | 2.50492307273 -> 2.65937402134

Revision             Result                    N
chromium@474400      2.50492 +- 0.0848718      6      good
chromium@474500      2.4803 +- 0.106917        6      good
chromium@474525      2.51428 +- 0.0849702      6      good
chromium@474538      2.48021 +- 0.0888774      6      good
chromium@474539      2.62113 +- 0.070139       6      bad       <--
chromium@474540      2.64849 +- 0.0691304      6      bad
chromium@474541      2.63623 +- 0.084777       6      bad
chromium@474544      2.66034 +- 0.0619242      6      bad
chromium@474550      2.66206 +- 0.11053        6      bad
chromium@474599      2.65937 +- 0.0858094      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 thread_times.key_silk_cases

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8976996240771385776

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5009244832661504


| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Speed>Bisection.  Thank you!

Should be back to normal levels ToT after I landed https://codereview.chromium.org/2917743002/