Roll Skia from 4db57264955f to 21c8ad62cd82 (2 revisions) (#24774)

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': '4db57264955f39cd840a833d8dd899809c54882a',
+  'skia_revision': '21c8ad62cd820f43acaaedba7d8445361492eb99',
 
   # 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: f9c8808921ac7b6a6a561f3875d50261
+Signature: f6a9701fd2565cabc38803e5bb6e6665
 
 UNUSED LICENSES: