Roll src/third_party/skia a13c7744f154f434b5415688280b4e127a2ce8f5..6808e2d1faaccd6fc739f436c2470f199aa4d1a8 (2 commits) (flutter/engine#10281)

https://skia.googlesource.com/skia.git
/compare/a13c7744f154..6808e2d1faac

git log a13c7744f154..6808e2d1faac --date=short --no-merges --format=%ad %ae %s
2019-07-31 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-07-31 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 cbabea734cbd..1ebe6014389e (9 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 (benjaminwagner@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': 'a13c7744f154f434b5415688280b4e127a2ce8f5',
+  'skia_revision': '6808e2d1faaccd6fc739f436c2470f199aa4d1a8',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 8807a7b70a17eb7f323e716d8b11afcd
+Signature: 5c77485bb428ca206b9256629689ca90
 
 UNUSED LICENSES: