Roll Skia from 0ecfdea19978 to a6bff0c3446b (3 revisions) (#23968)

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': '0ecfdea19978bd02b493477f06f5d6d2b0708a9f',
+  'skia_revision': 'a6bff0c3446bb8f85f61aac7746f5810c3179392',
 
   # 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: 8f523d0318ef364dd123780db6938646
+Signature: e3f1bc2314feae640582f81db921fb53
 
 UNUSED LICENSES: