All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=783909

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=25b3ad93c6e929faf4bdd5d6d772a1f323a4184bb544f27a76acf6008732619f


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

chromium-rel-win7-gpu-ati

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963282284684893248

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

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/tough_canvas_cases_rendering_throughput_bouncing_png_images.html

Revision             Result                  N
chromium@491832      522.779 +- 159.454      21      good
chromium@492302      7.246 +- 0.0            1       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 --story-filter=tough.canvas.cases.rendering.throughput.bouncing.png.images.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/8963282284684893248


For feedback, file a bug with component Speed>Bisection

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963217045542937632

=== BISECT JOB RESULTS ===
NO Test failure found

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/tough_canvas_cases_rendering_throughput_bouncing_png_images.html

Revision             Exit Code      N
chromium@491832      0 +- N/A       20      good
chromium@492302      0 +- N/A       20      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 --story-filter=tough.canvas.cases.rendering.throughput.bouncing.png.images.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/8963217045542937632


For feedback, file a bug with component Speed>Bisection

Bisect can't repro. Looks like it's bimodal, and shifting to the lower value?