Roll src/third_party/skia b80d31f8cbe2..f4b3d6b9f3d1 (1 commits) (#13229)

https://skia.googlesource.com/skia.git/+log/b80d31f8cbe2..f4b3d6b9f3d1

git log b80d31f8cbe2..f4b3d6b9f3d1 --date=short --no-merges --format='%ad %ae %s'
2019-10-18 senorblanco@chromium.org Dawn: fix single-sided stencil.

Created with:
  gclient setdep -r src/third_party/skia@f4b3d6b9f3d1

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 csmartdalton@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=csmartdalton@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': 'b80d31f8cbe28ec43db74a50f01bc695404ffa91',
+  'skia_revision': 'f4b3d6b9f3d1530131016d589a76b7ac057fecc2',
 
   # 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: a021f7cbae384bad66494e6292da5892
+Signature: 5d135b9aa2c4d5e55ca7d29bbed28183
 
 UNUSED LICENSES: