Roll src/third_party/skia 81756e4cae95..b9416caa367a (6 commits) (#9305)

https://skia.googlesource.com/skia.git
/%2Blog/81756e4cae95..b9416caa367a

git log 81756e4cae9547a525d039128a870e336f13114b..b9416caa367a770e55935916e135572c2461ca37 --date=short --no-merges --format=%ad %ae %s
2019-06-12 brianosman@google.com SkSL: Fix parsing of array types
2019-06-12 mtklein@google.com tighten up loop test
2019-06-12 egdaniel@google.com Fix setting of pipeline barrier in creating backend VkImage.
2019-06-12 robertphillips@google.com Add Ganesh support for RGBA_16161616 and RG_half
2019-06-12 rmistry@google.com Add tip on patching to G3 bot
2019-06-12 mtklein@google.com expand unit tests, fix extract

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 (herb@google.com), and stop
the roller if necessary.

DEPS

@@ -24,7 +24,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': '81756e4cae9547a525d039128a870e336f13114b',
+  'skia_revision': 'b9416caa367a770e55935916e135572c2461ca37',
 
   # 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: 54490b96453a346844f14ccb7f0d9aa4
+Signature: 2ff06111c837276a63a36cfe4ee38e40
 
 UNUSED LICENSES: