Roll Skia from 6a272434c2b2 to bfc9be0f773f (2 revisions) (flutter#23867)

Author: skia-flutter-autoroll

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': '6a272434c2b227d86af7627daf196d58678f51f2',
+  'skia_revision': 'bfc9be0f773f047cb1bf38f4eebf6248fbc2ea35',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the