Roll Skia from 29917d8c97ca to 4b16117e94b2 (4 revisions) (#49310)

https://skia.googlesource.com/skia.git/+log/29917d8c97ca..4b16117e94b2

2023-12-20 johnstiles@google.com Revert "Fix fuzzer-discovered Metal issue with sk_LastFragColor."
2023-12-20 johnstiles@google.com Fix fuzzer-discovered Metal issue with sk_LastFragColor.
2023-12-20 johnstiles@google.com Remove unused accessor ThreadContext::Compiler.
2023-12-20 johnstiles@google.com Move Compiler::convertIdentifier method into SymbolTable.

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,jimgraham@google.com,jvanverth@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

@@ -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': '29917d8c97ca0ed30be3d6e429dc83c91dc50ae8',
+  'skia_revision': '4b16117e94b28e6a68d34f48db3a2beb5910628b',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 83ea2ed6abfc247f49b87ccef44ef0bc
+Signature: 675feb91b4030c79a0eb24fbfa530845
 
 ====================================================================================================
 LIBRARY: etc1