All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=768543

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=873076451ec301990e05f3577a6382b4e2abc545e0ef2e461d170dd8450801d5


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

chromium-rel-mac12
chromium-rel-mac12-mini-8gb

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8967446012945963952

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

Hi enne@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 : Adrienne Walker
  Commit : 92d549f9ab9342c069a1c4c335eeccabd5ed93d1
  Date   : Thu Sep 21 23:59:46 2017
  Subject: cc: Decode "at raster" images at raster task start

Bisect Details
  Configuration: mac_10_12_perf_bisect
  Benchmark    : rasterize_and_record_micro.top_25
  Metric       : rasterize_time/file___static_top_25_googleplus.html
  Change       : 33.92% | 4.78783333333 -> 6.41183333333

Revision             Result                    N
chromium@503610      4.78783 +- 0.0195661      6      good
chromium@503616      4.782 +- 0.0252982        6      good
chromium@503617      6.43183 +- 0.0569283      6      bad       <--
chromium@503618      6.4235 +- 0.0461898       6      bad
chromium@503619      6.4105 +- 0.0376763       6      bad
chromium@503622      6.40983 +- 0.0208046      6      bad
chromium@503634      6.441 +- 0.158707         6      bad
chromium@503658      6.41183 +- 0.0856086      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=file...static.top.25.googleplus.html rasterize_and_record_micro.top_25

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8967446012945963952


For feedback, file a bug with component Speed>Bisection

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5d1be840afed203dee9425853a0a64b9d61cdd3b

commit 5d1be840afed203dee9425853a0a64b9d61cdd3b
Author: Khushal <khushalsagar@chromium.org>
Date: Fri Sep 29 17:51:17 2017

cc: Address raster regression from PlaybackImageProvider construction.

Adding additional parameters to PlaybackImageProvider ctor causes a
regression in total raster time on some mac configs. In order to address
this, break out these settings to a separate struct which can optionally
be given to the provider. The params are modified on the Settings
object post construction.

R=enne@chromium.org

Bug:  768538 ,  768543 
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I0e7fc0df225826e5a26f0f9d09c106a6b2d1f640
Reviewed-on: https://chromium-review.googlesource.com/691206
Reviewed-by: enne <enne@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505416}
[modify] https://crrev.com/5d1be840afed203dee9425853a0a64b9d61cdd3b/cc/benchmarks/rasterize_and_record_benchmark_impl.cc
[modify] https://crrev.com/5d1be840afed203dee9425853a0a64b9d61cdd3b/cc/raster/playback_image_provider.cc
[modify] https://crrev.com/5d1be840afed203dee9425853a0a64b9d61cdd3b/cc/raster/playback_image_provider.h
[modify] https://crrev.com/5d1be840afed203dee9425853a0a64b9d61cdd3b/cc/raster/playback_image_provider_unittest.cc
[modify] https://crrev.com/5d1be840afed203dee9425853a0a64b9d61cdd3b/cc/tiles/tile_manager.cc