Roll Skia from 37a2a8c95f34 to 93c6a6dd404d (2 revisions) (flutter/engine#46502)

https://skia.googlesource.com/skia.git/+log/37a2a8c95f34..93c6a6dd404d

2023-10-03 robertphillips@google.com [graphite] Add an AddDitherBlock helper function
2023-10-03 penghuang@chromium.org graphite: caching wgpu::BindGroupLayout in graphite pipeline objects

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,chinmaygarde@google.com,djsollen@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://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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': '37a2a8c95f34af7a8715a83fafe37c2203c08d3f',
+  'skia_revision': '93c6a6dd404df867f37b7296371b68b48dd8f45f',
 
   # 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: 9942a543a516ffcf0d69f9e5bf226b0d
+Signature: 33041bc734ed913adb2ba8cf14e94fb6
 
 ====================================================================================================
 LIBRARY: etc1