Roll src/third_party/skia 842e92e29216..b851469b8e96 (6 commits) (#9568)

https://skia.googlesource.com/skia.git
/%2Blog/842e92e29216..b851469b8e96

git log 842e92e2921682553e32904b455cf36df8079f28..b851469b8e964cf20ca911ba2acc4353084c08eb --date=short --no-merges --format=%ad %ae %s
2019-06-28 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-06-28 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 a9dfb3ba5db1..923c30fba116 (9 commits)
2019-06-28 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 1fffa0139440..9ef8c105f0dc (439 commits)
2019-06-28 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 522d51219054..40495290dceb (4 commits)
2019-06-27 rmistry@google.com [lottie-web-perf] Use canvas renderer for lottie-web
2019-06-27 mtklein@google.com disable SkVM JIT on Android

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': '842e92e2921682553e32904b455cf36df8079f28',
+  'skia_revision': 'b851469b8e964cf20ca911ba2acc4353084c08eb',
 
   # 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: de29e61a64e0757e8368f61e2f65c38f
+Signature: ad755e0f825f05a474a393cc529c5e68
 
 UNUSED LICENSES: