Roll Skia from d1b71ea5e580 to 6bc9982ca375 (1 revision) (#165958)

https://skia.googlesource.com/skia.git/+log/d1b71ea5e580..6bc9982ca375

2025-03-26 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE
from 3cf0e75590af to 7831e2ad53fd (5 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 jimgraham@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

DEPS

@@ -14,7 +14,7 @@ vars = {
   'flutter_git': 'https://flutter.googlesource.com',
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
-  'skia_revision': 'd1b71ea5e5808f6b4b4a1a5f68a4ce09d9888bd8',
+  'skia_revision': '6bc9982ca375cfdb16f9899b6d5cfb0e3c74ff60',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.