Roll Skia from 789552988917 to 6abfcf819da1 (2 revisions) (#38513)

https://skia.googlesource.com/skia.git/+log/789552988917..6abfcf819da1

2022-12-27 [email protected] Roll SK Tool from 6a9f86b6d20d to e20f0ca9037d
2022-12-27 [email protected] Roll ANGLE from 309269ce1044 to 03b928dbf40c (2 revisions)

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 [email protected],[email protected] 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': '789552988917fe46ad9486c31e69233d1d609d4f',
+  'skia_revision': '6abfcf819da19487c4b47e6937979bd39234a896',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.