All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=787811

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=54d8222760a07aba7f8e2d2862c870bd170409fee9c582465a0b83754a809bf0


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

android-webview-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962219026401317968

=== BISECT JOB RESULTS ===
NO Perf regression found, tests failed to produce values

Bisect Details
  Configuration: android_webview_arm64_aosp_perf_bisect
  Benchmark    : blink_perf.canvas
  Metric       : createImageBitmapFromImageData/createImageBitmapFromImageData


Please refer to the following doc on diagnosing blink_perf regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/speed/benchmark_harnesses/blink_perf.md

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

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8962219026401317968


For feedback, file a bug with component Speed>Bisection

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962037114692523696

=== BISECT JOB RESULTS ===
NO Perf regression found

Bisect Details
  Configuration: android_nexus5X_perf_bisect
  Benchmark    : blink_perf.canvas
  Metric       : createImageBitmapFromImageData/createImageBitmapFromImageData

Revision             Result                    N
chromium@517818      79.1919 +- 0.450851       2      good
chromium@517889      39.6929 +- 0.0679075      3      bad

Please refer to the following doc on diagnosing blink_perf regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/speed/benchmark_harnesses/blink_perf.md

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 blink_perf.canvas

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8962037114692523696


For feedback, file a bug with component Speed>Bisection

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/02dbe866ad7f51475007f46673253ed934179529

commit 02dbe866ad7f51475007f46673253ed934179529
Author: Reza.Zakerinasab <zakerinasab@chromium.org>
Date: Mon Dec 04 21:55:48 2017

Address canvas perf regressions in createImageBitmapFromImageData

This change tries to address the perf regression reported for
createImageBitmapFromImageData canvas perf test. This change performs
the premul operation in ImageData in advance, instead of doing that after
creating the ImageBitmap. This has resulted in ~60% perf improvement
on the local Linux machine, so it hopefully must address the regressions.

Bug:  782813 , 787772 , 787811 
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: If0f02d99677348d49cc9d16e910113b4250afb69
Reviewed-on: https://chromium-review.googlesource.com/802855
Reviewed-by: Justin Novosad <junov@chromium.org>
Commit-Queue: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521476}
[modify] https://crrev.com/02dbe866ad7f51475007f46673253ed934179529/third_party/WebKit/Source/core/html/ImageData.cpp
[modify] https://crrev.com/02dbe866ad7f51475007f46673253ed934179529/third_party/WebKit/Source/core/html/ImageData.h
[modify] https://crrev.com/02dbe866ad7f51475007f46673253ed934179529/third_party/WebKit/Source/core/imagebitmap/ImageBitmap.cpp
[modify] https://crrev.com/02dbe866ad7f51475007f46673253ed934179529/third_party/WebKit/Source/core/imagebitmap/ImageBitmap.h
[modify] https://crrev.com/02dbe866ad7f51475007f46673253ed934179529/third_party/WebKit/Source/platform/graphics/GraphicsTypes.h

 Issue 787810  has been merged into this issue.