All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=758884

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=f45b49d3b114227e4176b252e4089ef5713750408eeeacb6081cdc694cc5282c


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

android-nexus7v2

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8970299642651976288

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

Suspected Commit
  Author : Khushal
  Commit : 78cf6d75aa98c913dfcf79455ba70318438613bf
  Date   : Wed Aug 16 03:57:39 2017
  Subject: blink: Cache PaintImages in BitmapImage.

Bisect Details
  Configuration: android_nexus7_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/http___ie.microsoft.com_testdrive_Performance_SpeedReading_Default.html
  Change       : 750.49% | 16.6768390667 -> 141.835359128

Revision             Result                    N
chromium@494559      16.6768 +- 0.0468377      5      good
chromium@494631      18.3329 +- 7.51565        5      good
chromium@494667      17.6053 +- 5.04083        6      good
chromium@494685      19.8983 +- 11.3569        6      good
chromium@494688      17.7928 +- 4.93496        5      good
chromium@494689      19.4366 +- 7.82811        5      good
chromium@494690      139.758 +- 8.54902        6      bad       <--
chromium@494694      137.367 +- 12.1925        6      bad
chromium@494703      141.835 +- 6.94965        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 --story-filter=http...ie.microsoft.com.testdrive.Performance.SpeedReading.Default.html smoothness.tough_canvas_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8970299642651976288


For feedback, file a bug with component Speed>Bisection