Roll Skia from a9dbb2479c26 to 6f17f2ebb2e5 (2 revisions) (flutter#163109)

https://skia.googlesource.com/skia.git/+log/a9dbb2479c26..6f17f2ebb2e5

2025-02-12 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn
from a1770b70c6be to 4111d9e10b6a (40 revisions)
2025-02-12 bungeman@google.com [pdf] Apply paint alpha to color shader
alpha

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 jamesgk@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': 'a9dbb2479c26676e04d789c825a90d31b3ae5b74',
+  'skia_revision': '6f17f2ebb2e59a9fc7fdfdaa2f04fc77afc744a0',
 
   # 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: c242678343689135034a0aca7519cc80
+Signature: f0a725016c8fc8471bc7977e2a363602
 
 ====================================================================================================
 LIBRARY: etc1