Roll Skia from 75c756e029c9 to 19bff385f7e8 (3 revisions) (flutter#177316)

https://skia.googlesource.com/skia.git/+log/75c756e029c9..19bff385f7e8

2025-10-21 [email protected] Roll
vulkan-deps from 09230baa1307 to dd90c9921fd2 (3 revisions)
2025-10-21 [email protected] Expose SkBlendModeBlender singletons
without reference counting
2025-10-21 [email protected] Move pathref specific methods into a
separate file

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
[email protected],[email protected],[email protected] 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': '75c756e029c9a155236f5de18f2272a78b555a0c',
+  'skia_revision': '19bff385f7e8a1b33237787d7672f72c4de4f760',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.