Roll Skia from 7781dda8104f to 3c1ecab42cd4 (2 revisions) (flutter/engine#41688)

https://skia.googlesource.com/skia.git/+log/7781dda8104f..3c1ecab42cd4

2023-05-03 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Skia Infra from 73da11c893a5 to 502a387d3238 (7 revisions)
2023-05-03 armansito@google.com [sksl][wgsl] Prefix expressions and matrix equality test

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 brianosman@google.com,bungeman@google.com,jimgraham@google.com,rmistry@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://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

DEPS

@@ -18,7 +18,7 @@ vars = {
   'llvm_git': 'https://llvm.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '7781dda8104f73846d3e6cf7000195b6f10f0d56',
+  'skia_revision': '3c1ecab42cd4eb1b504e19270e41111c9de73607',
 
   # 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: fc45eb9b691209704c902c87ce994cdb
+Signature: 8b7e5ae462e33752ff99f502dcdd4d79
 
 ====================================================================================================
 LIBRARY: etc1