Roll src/third_party/skia 4683942a45f6..76616a10a786 (8 commits) (#7365)

https://skia.googlesource.com/skia.git/%2Blog/4683942a45f6..76616a10a786

git log 4683942a45f6927435249677adceefdb8c424443..76616a10a78604139cb3da13ef051246fe8fb828 --date=short --no-merges --format=%ad %ae %s
2019-01-04 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 9fa54eab2590..e4109f27136d (7 commits)
2019-01-03 recipe-roller@chromium.org Roll recipe dependencies (trivial).
2019-01-03 csmartdalton@google.com Allow aliasing in GrProxyProvider::processInvalidUniqueKey
2019-01-03 benjaminwagner@google.com Revert "Remove win_vulkan_sdk."
2019-01-03 benjaminwagner@google.com [infra] Upgrade Win10 in Skolo.
2019-01-03 benjaminwagner@google.com Remove win_vulkan_sdk.
2019-01-03 michaelludwig@google.com Use specialized quad lists in rectangle ops
2019-01-03 reed@google.com change textutils to require font param

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 (bungeman@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': '4683942a45f6927435249677adceefdb8c424443',
+  'skia_revision': '76616a10a78604139cb3da13ef051246fe8fb828',
 
   # 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: 2df6d3ed3416daadb5c62ded175dc114
+Signature: c88dc6544e8b3a0f66595155fdc9db06
 
 UNUSED LICENSES: