All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=645535

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgvtqU6QsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg_r-VvwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgwcuQ_woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICggaK1-ggM


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

chromium-rel-mac11

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9001974056445565152

===== BISECT JOB RESULTS =====
Status: completed


=== Bisection aborted ===
The bisect was aborted because The metric values for the initial "good" and "bad" revisions do not represent a clear regression.
Please contact the the team (see below) if you believe this is in error.

=== Warnings ===
The following warnings were raised by the bisect job:

 * Bisect failed to reproduce the regression with enough confidence.

===== TESTED REVISIONS =====
Revision         Mean     Std Dev  N   Good?
chromium@414536  61.7317  22.6637  18  good
chromium@414552  76.7493  56.5955  18  bad

Bisect job ran on: mac_10_11_perf_bisect
Bug ID: 645535

Test Command: src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --also-run-disabled-tests smoothness.top_25_smooth
Test Metric: first_gesture_scroll_update_latency/http___sports.yahoo.com_
Relative Change: 19.40%
Score: 0

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_10_11_perf_bisect/builds/882
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9001974056445565152


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5788084308803584

| 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 Tests>AutoBisect.  Thank you!

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9001681092907602096

Lotta noisy alerts here. Tried to bisect on the clear ones.

Bisect failed: http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_10_11_perf_bisect/builds/891
Failure reason: the build has failed.
Additional errors:
The metric was not found in the test output.
Either of the initial "good" or "bad" revisions failed to be tested or built.

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9001669068183032352

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9001669027623252768

Bisect failed: http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_10_11_perf_bisect/builds/892
Failure reason: the build has failed.
Additional errors:
The metric was not found in the test output.
Either of the initial "good" or "bad" revisions failed to be tested or built.

Bisect failed: http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_10_11_perf_bisect/builds/893
Failure reason: the build has failed.
Additional errors:
The metric was not found in the test output.
Either of the initial "good" or "bad" revisions failed to be tested or built.

There are a lot of possible CLs, but without bisect, it's hard to tell.
Possible CLs: https://chromium.googlesource.com/chromium/src/+log/336d51f5105c5079da6bd099b6e3843fc759a46b%5E..540ba6cbe242920544a1f43019e4f4a3c6f81bf8?pretty=fuller

Also, the performance un-regressed after this range of CLs (lots of reverts):
https://chromium.googlesource.com/chromium/src/+log/df9cb098cf816fb589e0ad6627012b524c78e9eb%5E..6b6ec1c01c7dac3ee76f9245e4ee442f1c669c55?pretty=fuller

It's unclear what broke this, but it was resolved after a bit. Won'tFix.

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8982584492710075072