Roll Skia from 559a46957250 to 476abcbc2e4d (4 revisions) (flutter/engine#53911)

https://skia.googlesource.com/skia.git/+log/559a46957250..476abcbc2e4d

2024-07-15 jvanverth@google.com Revert "[graphite] Remove unnecessary premul step in YUV shaders."
2024-07-15 johnstiles@google.com Reject SkSL programs with identifiers `dmatN` or `dmatNxM`.
2024-07-15 johnstiles@google.com Fix overzealous brace elimination in sksl-minify.
2024-07-15 nathanasanchez@google.com Run a graphite native vulkan test tryjob

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 bdero@google.com,brianosman@google.com,nicolettep@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://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': '559a469572504aed263dd2354c42368f9ca61f52',
+  'skia_revision': '476abcbc2e4ddbc1d0fde87a6871a98e4c4435d6',
 
   # 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: 8e2456fd024acd5fb7081020934d2565
+Signature: a1351b4e136d37f6c8dcc9c62be257a0
 
 ====================================================================================================
 LIBRARY: etc1