All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=630459

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg6pmv4AoM


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

chromium-rel-win7-gpu-intel

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9006484974162882752

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/9006484957344895536

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


===== SUSPECTED CL(s) =====
Subject : [CSS Grid Layout] Handle alignment with orthogonal flows
Author  : jfernandez
Commit description:
  
Now that grid sizing and positioning issues wrt orthogonal flows have
been clarified in the last spec draft, we can adapt now our alignment
logic to work with orthogonal flows.

Even though basic alignment would work with orthogonal flows with
this patch, we still doesn't allow stretching in that case. I'll provide a
patch for that feature since it's a complex logic and better have an
isolated change.

BUG= 556171 ,  445742 ,  376823 ,  249451 

Review-Url: https://codereview.chromium.org/842193004
Cr-Commit-Position: refs/heads/master@{#406557}
Commit  : af5c2165bff01ba473fe28d31dd2a15d789ef08e
Date    : Wed Jul 20 15:09:08 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev   N  Good?
chromium@406477  1284.91  3.45741   5  good
chromium@406523  1272.55  6.59786   5  good
chromium@406546  1299.51  0.911539  5  good
chromium@406552  1290.22  4.07354   5  good
chromium@406555  1286.37  4.65454   5  good
chromium@406556  1294.48  4.5083    5  good
chromium@406557  1104.52  3.71977   5  bad    <--
chromium@406558  1101.42  3.853     5  bad
chromium@406569  1114.12  2.84198   5  bad

Bisect job ran on: winx64intel_perf_bisect
Bug ID: 630459

Test Command: src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --also-run-disabled-tests blink_perf.layout
Test Metric: fixed-grid-lots-of-stretched-data/fixed-grid-lots-of-stretched-data
Relative Change: 13.29%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/winx64intel_perf_bisect/builds/1034
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9006484957344895536


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5857333779890176

| 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!

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

Hi wkorman@chromium.org, the bisect results pointed to your CL below as possibly
causing a regression. Please have a look at this info and see whether
your CL be related.


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


===== SUSPECTED CL(s) =====
Subject : Revert "Add a hack to set shouldPaint to true for force-composited iframes."
Author  : wkorman
Commit description:
  
Reason: Exploring as possible cause of compositing/paint time performance
regression.

Original change description:

This works around a FCB chicken-egg problem in which we are unable to properly
start painting floating iframes once they stop being composited.

https://codereview.chromium.org/2009353003

BUG= 610906 ,619710

Review-Url: https://codereview.chromium.org/2164813002
Cr-Commit-Position: refs/heads/master@{#406483}
Commit  : e080ea95241ea911fa5b97e27b18308ed4d8c1ae
Date    : Wed Jul 20 04:26:27 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev  N  Good?
chromium@406477  1285.09  5.61508  8  good
chromium@406480  1290.59  4.1253   5  good
chromium@406482  1280.87  3.89086  5  good
chromium@406483  1261.37  3.37105  5  bad    <--
chromium@406490  1273.95  4.57722  5  bad
chromium@406502  1274.04  4.35199  8  bad

Bisect job ran on: winx64intel_perf_bisect
Bug ID: 630459

Test Command: src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --also-run-disabled-tests blink_perf.layout
Test Metric: fixed-grid-lots-of-stretched-data/fixed-grid-lots-of-stretched-data
Relative Change: 0.61%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/winx64intel_perf_bisect/builds/1033
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9006484974162882752


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5839966140104704

| 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!