Roll Skia from e4273a995436 to c6a481bef3fb (1 revision) (flutter#38025)

https://skia.googlesource.com/skia.git/+log/e4273a995436..c6a481bef3fb

2022-12-02 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SK Tool from a96fcb86b983 to 2195169c3c87

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 bungeman@google.com,zra@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

Author: skia-flutter-autoroll

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': 'e4273a995436858d0ce29c9383ac8b92ac2b32b9',
+  'skia_revision': 'c6a481bef3fbf251354610b6ebe9cadc5c7e03c7',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: bac4bc0fcbeb63cdf9eb003bc695c61b
+Signature: fca2aa78824fe1ee1ac72248bd7f7821
 
 UNUSED LICENSES: