Roll Skia from cef18d10b363 to 521b8c4bb011 (1 revision) (#42605)

https://skia.googlesource.com/skia.git/+log/cef18d10b363..521b8c4bb011

2023-06-06 robertphillips@google.com Revert "Add unit test for large images"

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 borenet@google.com,brianosman@google.com,jacksongardner@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': 'cef18d10b3633c30ab0cde8996b0a981b5a61079',
+  'skia_revision': '521b8c4bb011f9847b20ed2d7e17e4c288b996f9',
 
   # 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: 082826fe4a7f3f97d8fee3e6706b9f92
+Signature: d9fe0fd6958d93e2bbd29d78b782f55d
 
 ====================================================================================================
 LIBRARY: etc1