Roll Skia from 5bdda9a41db9 to 6284b4f09e14 (3 revisions) (flutter#178849)

https://skia.googlesource.com/skia.git/+log/5bdda9a41db9..6284b4f09e14

2025-11-20 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE
from 7b89c0056fc1 to a0962979c751 (11 revisions)
2025-11-20 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Skia
Infra from f90f8d916021 to 4c3f46be5e92 (8 revisions)
2025-11-20 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn
from d7523eb33930 to d5803ab29495 (6 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
codefu@google.com,kjlubick@google.com,robertphillips@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': '5bdda9a41db99925e5501e3a17bb9027af2d8c4c',
+  'skia_revision': '6284b4f09e144d9f013e8c9e6242348af8d0fc70',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.