Roll Skia from 2aa9e6359a5c to 4a220d6ecac7 (2 revisions) (flutter/engine#51699)

https://skia.googlesource.com/skia.git/+log/2aa9e6359a5c..4a220d6ecac7

2024-03-27 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from 5de7eb219957 to d03adea71fc0 (8 revisions)
2024-03-27 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Skia Infra from f847b3c18c27 to a21b7442fbc2 (13 revisions)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC brianosman@google.com,jacksongardner@google.com,jamesgk@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Skia: https://bugs.chromium.org/p/skia/issues/entry
To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

DEPS

@@ -14,7 +14,7 @@ vars = {
   'flutter_git': 'https://flutter.googlesource.com',
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
-  'skia_revision': '2aa9e6359a5c47446719cef4863d31f8038a100f',
+  'skia_revision': '4a220d6ecac77b4ca344df133d4894b2ab941a99',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 673fabf80d07e41cf7d4cc5278746cb4
+Signature: 89d0f5cefe0ab8bb5115fed60092705a
 
 ====================================================================================================
 LIBRARY: etc1