Roll Skia from 57d859edd3c4 to 994ce8cf2300 (1 revision) (flutter#20129)

Author: skia-flutter-autoroll

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': '57d859edd3c49bbea01ba8df8fde2b90de160702',
+  'skia_revision': '994ce8cf2300c094b7302afbef3c067e6f988744',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the