Roll Skia from a26e0b3ca4df to 8c9f983ee600 (1 revision) (flutter#50134)

https://skia.googlesource.com/skia.git/+log/a26e0b3ca4df..8c9f983ee600

2024-01-29 [email protected] Roll Dawn from 4625676a9344 to d34d67a984ea (15 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 [email protected],[email protected],[email protected],[email protected] 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

@@ -16,7 +16,7 @@ vars = {
   'llvm_git': 'https://llvm.googlesource.com',
   # OCMock is for testing only
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': 'a26e0b3ca4df40875d0a54f78eee927f33324854',
+  'skia_revision': '8c9f983ee60081160de6d6de1e07020983340861',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.