Roll Skia from a1ff98bebf89 to 7e9b94634911 (2 revisions) (flutter#45707)

https://skia.googlesource.com/skia.git/+log/a1ff98bebf89..7e9b94634911

2023-09-12 kjlubick@google.com Disable legacy GrDirectContext methods for Flutter
2023-09-12 johnstiles@google.com Add support for the pixel_local modifier to WGSL.

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 bdero@google.com,brianosman@google.com,jmbetancourt@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

Author: skia-flutter-autoroll

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': 'a1ff98bebf8974997b316c9f5c2c7f7c90b258be',
+  'skia_revision': '7e9b946349117dfba256b89980fe29c63870273b',
 
   # 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: 6033db70761f02c60845d056a67518e7
+Signature: 677270cf1ab61ce01730f7b30bf0a1c7
 
 ====================================================================================================
 LIBRARY: etc1