All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=902545

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=74fa3434195b90802cf62e8b1064ac4b001d11fa7d6b7da05fad753ad8e1b452


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

Android Nexus5X WebView Perf
Android Nexus6 WebView Perf

rendering.mobile - Benchmark documentation link:
  https://bit.ly/rendering-benchmarks

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/12dd35dde40000

📍 Found significant differences after each of 6 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/12dd35dde40000

make gray8 support uniformly weird by mtklein@google.com
https://skia.googlesource.com/skia/+/b1df5e5b32b2f5b00cd959ef449da7f1f7ba74a6
thread_raster_cpu_time_per_frame: 661 → 658.6 (-2.372)

eliminate srcover_bgra_8888 by mtklein@google.com
https://skia.googlesource.com/skia/+/dd9bfe9a32792958d7da60796327ba5380a43624
thread_raster_cpu_time_per_frame: 658.6 → 630.4 (-28.23)

[canvaskit] Slice out SkPicture by kjlubick@google.com
https://skia.googlesource.com/skia/+/32dfdbe1afbe04f221d48a718d4984f6e7b4da11
thread_raster_cpu_time_per_frame: 630.4 → 637.7 (+7.361)

trim off more bgra stages by mtklein@google.com
https://skia.googlesource.com/skia/+/1a3eb52992fa0d44da02a0efbe704d1e8db8b9dd
thread_raster_cpu_time_per_frame: 638.8 → 683.9 (+45.08)

Roll third_party/externals/swiftshader b83d4911baae..e70c3514e5a0 (1 commits) by skia-autoroll@skia-public.iam.gserviceaccount.com
https://skia.googlesource.com/skia/+/dbac839f07a682e6685ab5a4536e137f779b85b8
thread_raster_cpu_time_per_frame: 684.4 → 681.9 (-2.468)

Roll src/third_party/skia dd254486280d..0c583af06d50 (10 commits) by chromium-autoroll@skia-public.iam.gserviceaccount.com
https://chromium.googlesource.com/chromium/src/+/431f414472199058925992e46bb9ed833ceaaffd
thread_raster_cpu_time_per_frame: 681.9 → 714.3 (+32.44)

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

Benchmark documentation link:
  https://bit.ly/rendering-benchmarks