Roll Skia from 9c4cfcd16529 to b7a1f4fdedc1 (2 revisions) (#44430)

https://skia.googlesource.com/skia.git/+log/9c4cfcd16529..b7a1f4fdedc1

2023-08-07 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SK Tool from 0e52994bf1b6 to c8d53e7227c9
2023-08-07 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Skia Infra from ed824b45206d to 0e52994bf1b6 (4 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,jacksongardner@google.com,jcgregorio@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': '9c4cfcd165298b9a6d4cf7df50569e60b55257f0',
+  'skia_revision': 'b7a1f4fdedc183a8ac3dc69026b668c74beed405',
 
   # 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: 75b393388bee0c8dd2ae8e64f327b3c3
+Signature: 9eacb36f0e7246df4d43f96f356f3116
 
 ====================================================================================================
 LIBRARY: etc1