All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=718045

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgsozelQkM


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

chromium-rel-win7-gpu-ati

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8980603683508566896

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

Hi chrishtr@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 : chrishtr
  Commit : 7c90da71a8f435ae99bb7f90e0cc1cfcc96cc1fd
  Date   : Tue Apr 25 07:27:45 2017
  Subject: Refactor to centralize code which decides whether ObjectPaintProperties are needed.

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : blink_perf.paint
  Metric       : complex-content-slow-scroll/complex-content-slow-scroll
  Change       : 10.53% | 184.9625 -> 204.447666667

Revision             Result                   N
chromium@466901      184.963 +- 0.930897      6      good
chromium@466915      186.251 +- 1.24692       6      good
chromium@466916      204.122 +- 4.3497        6      bad       <--
chromium@466917      200.319 +- 1.40643       6      bad
chromium@466919      202.405 +- 2.00423       6      bad
chromium@466922      200.689 +- 1.76128       6      bad
chromium@466928      203.493 +- 1.62821       6      bad
chromium@466954      204.448 +- 1.95859       6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests blink_perf.paint

Debug Info
  https://chromeperf.appspot.com/buildbucket_job_status/8980603683508566896

Is this bisect wrong?
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5284258760884224


| 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!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ba864de6c45b5a5379488e3b234474d7ca574f4e

commit ba864de6c45b5a5379488e3b234474d7ca574f4e
Author: chrishtr <chrishtr@chromium.org>
Date: Mon May 15 21:28:20 2017

Don't clear or allocate paint properties if they won't change.

BUG= 718045 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2880423002
Cr-Commit-Position: refs/heads/master@{#471907}

[modify] https://crrev.com/ba864de6c45b5a5379488e3b234474d7ca574f4e/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b717e22b72275498d43183016392b2ae0a011b3e

commit b717e22b72275498d43183016392b2ae0a011b3e
Author: chrishtr <chrishtr@chromium.org>
Date: Mon May 15 23:58:48 2017

Don't bother checking for paint properties for classes that never need them.

In local testing,
PerformanceTests/Paint/complex-content-slow-scroll.html improves by about
10%.

BUG= 718045 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2883153002
Cr-Commit-Position: refs/heads/master@{#471952}

[modify] https://crrev.com/b717e22b72275498d43183016392b2ae0a011b3e/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1b3799fee23bfbfc578c184236a4b3f663509f95

commit 1b3799fee23bfbfc578c184236a4b3f663509f95
Author: chrishtr <chrishtr@chromium.org>
Date: Thu May 18 16:52:12 2017

Only call paint property-requiring subroutines if there are actually properties.

Local testing seems to show a 10% or so performance improvement on
Paint/complex-content-slow-scroll.html.

BUG= 718045 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2

Review-Url: https://codereview.chromium.org/2886133003
Cr-Commit-Position: refs/heads/master@{#472846}

[modify] https://crrev.com/1b3799fee23bfbfc578c184236a4b3f663509f95/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
[modify] https://crrev.com/1b3799fee23bfbfc578c184236a4b3f663509f95/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.h

Dup'ing the rest of the bug into the other one.