Roll Skia from 4ad05fb042c5 to c9647f13cded (2 revisions) (flutter/engine#56933)

https://skia.googlesource.com/skia.git/+log/4ad05fb042c5..c9647f13cded

2024-12-04 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Skia Infra from 667c4e94b4a5 to 2d420a4dcfc4 (3 revisions)
2024-12-04 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from ecd0b68434f4 to e0d7445de8cd (17 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 bdero@google.com,jvanverth@google.com,kjlubick@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': '4ad05fb042c52b10e3e7bbaa46ad0eb589acb851',
+  'skia_revision': 'c9647f13cdedac9871fd93a70e3fa27d8f8972b9',
 
   # 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: ff28a1de492a403f3a60708fcf735a8a
+Signature: 4642a9c41e5bde12a29ae2b31a095b9c
 
 ====================================================================================================
 LIBRARY: etc1