Roll Skia from a12796b42c0e to 3cffe81f0d16 (4 revisions) (#25514)

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': 'a12796b42c0e946bad64ec84fd97f19233ab116b',
+  'skia_revision': '3cffe81f0d16af0da0033c77c86faa0e92bfccdc',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

ci/licenses_golden/licenses_skia

-Signature: cd02151fc8ef852c8f5ec58694f0a17a
+Signature: 9853ae7a85da91ce9981d14350f5c368
 
 UNUSED LICENSES: