Roll src/third_party/skia ad5f06949033..df246b9c1bbd (8 commits) (#6962)

https://skia.googlesource.com/skia.git/+log/ad5f06949033..df246b9c1bbd


Created with:
  gclient setdep -r src/third_party/skia@df246b9c1bbd

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

DEPS

@@ -23,7 +23,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': 'ad5f069490332881eab0697c5c06807f5f89d865',
+  'skia_revision': 'df246b9c1bbd125afa8350595101b7399f7515a3',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

ci/licenses_golden/licenses_skia

-Signature: 03ade9bd1ada22cf66f97d26b1b89935
+Signature: 10d7fd3dea1dbbff3b5eb68f87673a6b
 
 UNUSED LICENSES:
 
@@ -4192,7 +4192,6 @@ FILE: ../../../third_party/skia/gm/srgb.cpp
 FILE: ../../../third_party/skia/gm/testgradient.cpp
 FILE: ../../../third_party/skia/gm/text_scale_skew.cpp
 FILE: ../../../third_party/skia/gm/thinconcavepaths.cpp
-FILE: ../../../third_party/skia/gm/tonalshadows.cpp
 FILE: ../../../third_party/skia/gm/tosrgb_colorfilter.cpp
 FILE: ../../../third_party/skia/include/android/SkAndroidFrameworkUtils.h
 FILE: ../../../third_party/skia/include/atlastext/SkAtlasTextContext.h