Roll Skia from 1a4ca755288a to 6fbc6c75b9bb (1 revision) (#180167)

https://skia.googlesource.com/skia.git/+log/1a4ca755288a..6fbc6c75b9bb

2025-12-20 skia-autoroll@skia-public.iam.gserviceaccount.com Roll
vulkan-deps from 686b39ce6344 to 0c76069c94c9 (2 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 aaclarke@google.com,brettos@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
diff --git a/DEPS b/DEPS
index 89d0021..010292b 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': '1a4ca755288a3dd0718125021a1cc54e231e2262',
+  'skia_revision': '6fbc6c75b9bb7e09edaaf6a4ab293e7e88643b17',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.