Roll Skia from cb15e1452399 to ebb6051e8bb1 (5 revisions) (flutter#174296)

https://skia.googlesource.com/skia.git/+log/cb15e1452399..ebb6051e8bb1

2025-08-22 ccameron@google.com Revert "HDR v2: Change
SkNamedTransferFn::kHLG/kPQ to new version"
2025-08-22 fmalita@google.com Image shader + tiny scale GM
2025-08-22 bungeman@google.com Android NDK font manager variation cache
2025-08-22 bungeman@google.com FontMgr Android NDK automatic axes
2025-08-22 skia-autoroll@skia-public.iam.gserviceaccount.com Roll
vulkan-deps from 7e28c4c2f184 to d74c51b56a14 (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 fmalita@google.com,jimgraham@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

@@ -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': 'cb15e145239981464e331cef70ccdb17f974e91b',
+  'skia_revision': 'ebb6051e8bb1d31c3e9860081c154e49a564c6ef',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.