Roll Skia from 6a7383e3dd9f to 8a9f3c9d1a1d (1 revision) (flutter/engine#31711)

https://skia.googlesource.com/skia.git/+log/6a7383e3dd9f..8a9f3c9d1a1d

2022-02-28 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from 4570ab5ad89a to faa889d0b046 (11 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 chinmaygarde@google.com,kjlubick@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

@@ -27,7 +27,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '6a7383e3dd9f6110ff04acefd9418fa5a313b87b',
+  'skia_revision': '8a9f3c9d1a1d8d6462b4b6063abad5daa48e7083',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 68efc5198aa67b4f94b3a6407fc9b294
+Signature: 27aceba16e39c28ab3dc8cabf438fd99
 
 UNUSED LICENSES: