Roll Skia from 486deb23bc2a to a31d9c3b4583 (2 revisions) (#38586)

https://skia.googlesource.com/skia.git/+log/486deb23bc2a..a31d9c3b4583

2023-01-01 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from f15c0f670d9e to ce3400170d0e (2 revisions)
2023-01-01 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE from 377667505182 to 4a8bc146fac6 (1 revision)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC borenet@google.com,garyq@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Skia: https://bugs.chromium.org/p/skia/issues/entry
To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

DEPS

@@ -18,7 +18,7 @@ vars = {
   'llvm_git': 'https://llvm.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '486deb23bc2a4d3d09c66fef52c2ad64d8b4f761',
+  'skia_revision': 'a31d9c3b45839e7512c300462d082b8e42423eb3',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.