Roll src/third_party/skia b47704b0bd34..f8486f2c5fb6 (2 commits) (#12312)

https://skia.googlesource.com/skia.git/+log/b47704b0bd34..f8486f2c5fb6

git log b47704b0bd34..f8486f2c5fb6 --date=short --no-merges --format='%ad %ae %s'
2019-09-17 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-17 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/skia@f8486f2c5fb6

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC brianosman@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
TBR=brianosman@google.com

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': 'b47704b0bd343809452d33ca41989b4520104b00',
+  'skia_revision': 'f8486f2c5fb6b0e9b7678a12066fda7fae6f5493',
 
   # 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: e331539f49ffb58bbe867712287faba6
+Signature: 4b441135765cdba550406933d2786765
 
 UNUSED LICENSES: