Roll src/third_party/skia 6ce447a4ec20..91032f8cd7ea (5 commits) (#9455)

https://skia.googlesource.com/skia.git
/%2Blog/6ce447a4ec20..91032f8cd7ea

git log 6ce447a4ec200834d1b34cb31eb7c50cfdad193e..91032f8cd7eaf5ab5d562b6bf8b726000ae33709 --date=short --no-merges --format=%ad %ae %s
2019-06-21 djsollen@google.com Fix typo to track sdk level not release property.
2019-06-24 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-06-24 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 bf4cfa77c4bf..dfd760055152 (10 commits)
2019-06-24 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 31223069ea1d..91f69e5c58f5 (388 commits)
2019-06-24 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader a7edc1cd1d8f..900e1dac1b2d (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 (djsollen@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': '6ce447a4ec200834d1b34cb31eb7c50cfdad193e',
+  'skia_revision': '91032f8cd7eaf5ab5d562b6bf8b726000ae33709',
 
   # 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: be45090298a92066584e623f19356bd0
+Signature: 61eac26066b650ebedd0be449705e580
 
 UNUSED LICENSES: