Roll Skia from 25bba45c7b25 to 799cfd39b501 (6 revisions) (flutter#168023)

https://skia.googlesource.com/skia.git/+log/25bba45c7b25..799cfd39b501

2025-04-29 nicolettep@google.com [graphite] Pass in correct size value
to shader data encoding
2025-04-29 jmbetancourt@google.com [skcapture] add missing capture
canvas destructor implementation
2025-04-29 robertphillips@google.com [graphite] Add ability to rein in
gradient Precompilation over-generation
2025-04-29 bungeman@google.com Re-train Chromebook jobs
2025-04-29 bungeman@google.com Fix chromebook.py build args
2025-04-29 michaelludwig@google.com [graphite] Clamp quantized mask blur
values to 1/32

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 bungeman@google.com,jsimmons@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': '25bba45c7b253ed3a735ae6c6d32173fbf5cc9e7',
+  'skia_revision': '799cfd39b501c9ef692bd247e3fa289df9ca2d3d',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: ab062f7d2c7be2443b482678d0c20077
+Signature: 8139e06806b623c4b6a7f09add45b3bf
 
 ====================================================================================================
 LIBRARY: etc1