Roll Skia from 920cdcadd74c to 6e6acf6644ef (1 revision) (flutter#177432)

https://skia.googlesource.com/skia.git/+log/920cdcadd74c..6e6acf6644ef

2025-10-23 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn
from 401ebd650cf0 to f027ea435086 (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
chinmaygarde@google.com,jmbetancourt@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

Author: engine-flutter-autoroll

DEPS

@@ -15,7 +15,7 @@ vars = {
   'flutter_git': 'https://flutter.googlesource.com',
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
-  'skia_revision': '920cdcadd74c112267295a2bf73107c25ffaef42',
+  'skia_revision': '6e6acf6644efa82de3d4cd369718c914f6e916fb',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.