Roll Skia from 2a7644cf4bd7 to df42581d2765 (3 revisions) (flutter/engine#39643)

https://skia.googlesource.com/skia.git/+log/2a7644cf4bd7..df42581d2765

2023-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE from 5c2a60102596 to 1145a4970d09 (12 revisions)
2023-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from a36600f98b9b to a9f5c19e28bd (1 revision)
2023-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Skia Infra from 0162309d048f to 87d3eee3434b (87 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,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': '2a7644cf4bd71942e16e06241e7c37c1734d6014',
+  'skia_revision': 'df42581d2765cb91a6fde1d427a647255ebec4aa',
 
   # 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: 8422a69b646cc0e4deba233598288683
+Signature: 6f6c3ac1767a07aff23a7c79196c5e0a
 
 ====================================================================================================
 LIBRARY: etc1