Roll Skia from 0e479728cc1f to 6b4bdebaab88 (1 revision) (#48536)

https://skia.googlesource.com/skia.git/+log/0e479728cc1f..6b4bdebaab88

2023-11-30 johnstiles@google.com Add tail pointer to SkRasterPipeline_BranchIfAllLanesActiveCtx.

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,jcgregorio@google.com,matanl@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': '0e479728cc1fd005fccba67c2b0307519a8a56dc',
+  'skia_revision': '6b4bdebaab88cd84de31a3d7902f60649d6c142f',
 
   # 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: 2ad0091669f7988d67dc57267888ed9b
+Signature: 9666dd22602be535e04f33c5b9661371
 
 ====================================================================================================
 LIBRARY: etc1