Roll src/third_party/skia b4d60b5eda31..5b4c0ee19b74 (1 commits) (#12390)

https://skia.googlesource.com/skia.git/+log/b4d60b5eda31..5b4c0ee19b74

git log b4d60b5eda31..5b4c0ee19b74 --date=short --no-merges --format='%ad %ae %s'
2019-09-23 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader b6fa949c4539..1f89f58faeb8 (5 commits)

Created with:
  gclient setdep -r src/third_party/skia@5b4c0ee19b74

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 bungeman@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=bungeman@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': 'b4d60b5eda31c7c03bb30424d6a1a3e841830a76',
+  'skia_revision': '5b4c0ee19b74cbd12ce0ea60a3c92024d113a6e7',
 
   # 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: edfaa58ddaf64ba8994151c56826b0a9
+Signature: e62b5f5b650d90e1024417088e8ed5ef
 
 UNUSED LICENSES: