Roll Skia from f69e8967610e to b6186e1b3995 (2 revisions) (#52726)

https://skia.googlesource.com/skia.git/+log/f69e8967610e..b6186e1b3995

2024-05-10 armansito@google.com Reland "[vello] Enable the bump allocation estimator"
2024-05-10 armansito@google.com Roll vello 6c1e8b815b1e...6938a2893d6a (18 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 brianosman@google.com,egdaniel@google.com,rmistry@google.com,zra@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

Author: skia-flutter-autoroll

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': 'f69e8967610e4e004fc13b3b8780bc731ea7c0f6',
+  'skia_revision': 'b6186e1b3995acf56b04be996dc5e1ac01c7accb',
 
   # 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: 48b98365acd58cd81f33f09efa125346
+Signature: 687f5cbadd09becf03b2d4117d4f3ebd
 
 ====================================================================================================
 LIBRARY: etc1