Roll src/third_party/skia 847d55be4e62..a94670bd08cd (1 commits) (#8631)

https://skia.googlesource.com/skia.git/%2Blog/847d55be4e62..a94670bd08cd

git log 847d55be4e6273fc3cd9c0b30c7bfc8a2d6575b7..a94670bd08cd52a19bf72223d63e2cc808b6b057 --date=short --no-merges --format=%ad %ae %s
2019-04-18 hcm@google.com Update Skia milestone to 76

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 (herb@google.com), 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': '847d55be4e6273fc3cd9c0b30c7bfc8a2d6575b7',
+  'skia_revision': 'a94670bd08cd52a19bf72223d63e2cc808b6b057',
 
   # 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: 1c665fa8b54bdf7301ff1ccfa0fc9522
+Signature: 8f0bff62f9f3e433604132c82ff095c8
 
 UNUSED LICENSES: