Roll src/third_party/skia 494aa3db9e78..836ff5e40560 (2 commits) (#8788)

https://skia.googlesource.com/skia.git
/%2Blog/494aa3db9e78..836ff5e40560

git log 494aa3db9e7883337c969257eef4e572366cb45f..836ff5e40560f8ae712b3e1949c051a9cdcd09a4 --date=short --no-merges --format=%ad %ae %s
2019-04-30 fmalita@chromium.org [skottie] Mask feather support
2019-04-29 bungeman@google.com Use linear metrics with new FreeType light autohint.

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 (ethannicholas@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': '494aa3db9e7883337c969257eef4e572366cb45f',
+  'skia_revision': '836ff5e40560f8ae712b3e1949c051a9cdcd09a4',
 
   # 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: 6952ca7908343a22aad278664c51b707
+Signature: 82c13d78cdf429d44d503d56aec6c6de
 
 UNUSED LICENSES: