Roll src/third_party/skia 857c9f955edb..8063f6cca025 (3 commits) (#9679)

https://skia.googlesource.com/skia.git
/%2Blog/857c9f955edb..8063f6cca025

git log 857c9f955edbfc635fa3e3f95f819aaa1efff461..8063f6cca02538ef152c2b7afc29d06cb750f034 --date=short --no-merges --format=%ad %ae %s
2019-07-04 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 66b5ff586c9c..c4ef62ec1a68 (9 commits)
2019-07-04 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 7625da7c0425..080c02ae0336 (375 commits)
2019-07-04 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader a29aa7717ff8..72d8104846de (2 commits)

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 (jvanverth@google.com), and stop
the roller if necessary.

DEPS

@@ -26,7 +26,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '857c9f955edbfc635fa3e3f95f819aaa1efff461',
+  'skia_revision': '8063f6cca02538ef152c2b7afc29d06cb750f034',
 
   # 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: a7c74372466d3e277f83d8944ebee806
+Signature: 64d0483f49b459d114853a7bf2b71330
 
 UNUSED LICENSES: