Roll Skia from 5ef1b00ac320 to 171b2bf1e496 (4 revisions) (#166931)

https://skia.googlesource.com/skia.git/+log/5ef1b00ac320..171b2bf1e496

2025-04-10 kjlubick@google.com Replace addPolyLine with addLine in
SkBasicEdgeBuilder
2025-04-10 skia-autoroll@skia-public.iam.gserviceaccount.com Roll
vulkan-deps from 1e366225664f to 5c8010f3b85e (3 revisions)
2025-04-10 bungeman@google.com Remove
SkScalerContext::forceGenerateImageFromPath
2025-04-10 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE
from f680e1074ba5 to 02fb04a81e75 (13 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
jlavrova@google.com,jonahwilliams@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

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': '5ef1b00ac32014c01ec74720d01c14445f870480',
+  'skia_revision': '171b2bf1e496735a04ecd317506ac869dc35ceae',
 
   # 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: 4d9beacfd1aab8ac30a3e4f9a31ab054
+Signature: 551bfc04b839f58059a9c3d141da2342
 
 ====================================================================================================
 LIBRARY: etc1