Roll Skia from cd6b0ff3596e to bbb0d6feaf1c (1 revision) (flutter/engine#49943)

https://skia.googlesource.com/skia.git/+log/cd6b0ff3596e..bbb0d6feaf1c

2024-01-22 jamesgk@google.com [graphite] Just use two scratch textures for mipmap generation

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,jonahwilliams@google.com,lovisolo@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

@@ -17,7 +17,7 @@ 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': 'cd6b0ff3596ed45839d1283a254825202360c6c6',
+  'skia_revision': 'bbb0d6feaf1cfe43423217d4b41ed03a41e819b8',
 
   # 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: 906f615802fd9b6e1ad1fea2ee7f259a
+Signature: 415e404faf6cc0c252f44ef42d5c6a39
 
 ====================================================================================================
 LIBRARY: etc1