Roll Skia from d0e12d575173 to 8851d5318c9d (2 revisions) (#180399)

https://skia.googlesource.com/skia.git/+log/d0e12d575173..8851d5318c9d

2025-12-30 bungeman@google.com Fix DirectWrite gradient creation
2025-12-30 skia-autoroll@skia-public.iam.gserviceaccount.com Roll
vulkan-deps from 321a6d6ef9ea to 1b81cd7b904d (1 revision)

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
chinmaygarde@google.com,kjlubick@google.com,maxhudnell@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
diff --git a/DEPS b/DEPS
index 250ca4e..8d397fc 100644
--- a/DEPS
+++ b/DEPS
@@ -15,7 +15,7 @@
   'flutter_git': 'https://flutter.googlesource.com',
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
-  'skia_revision': 'd0e12d575173918ed929903c1c3b0a0c16490c83',
+  'skia_revision': '8851d5318c9d4a3996a55d87669971fac1547ca3',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.