Roll Skia from 51f95129285f to b6981fb6a4c1 (1 revision) (#28523)

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': '51f95129285f11e3aecfeda8a0de7333f44de636',
+  'skia_revision': 'b6981fb6a4c1f6c2dd044d19782ab6ed428b2e56',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

ci/licenses_golden/licenses_skia

-Signature: 732f811fa00c96a04f14f7125b56ede9
+Signature: 738d868f1ca555617053cd5ab59b384c
 
 UNUSED LICENSES: