Roll Skia from 4964300530d3 to 51dc28505fb9 (5 revisions) (#21993)

DEPS

@@ -26,7 +26,7 @@ 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': '4964300530d35e66203d573d0bad13cde6cb484c',
+  'skia_revision': '51dc28505fb9bcf44c0815856fb9dc264a9f020b',
 
   # 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: 933058cc624f59168f2dd9a3a7cd2cd3
+Signature: a4bdc89922c88658a86abd8284af6921
 
 UNUSED LICENSES: