Roll src/third_party/skia 1bf30ce852e0..9e5c47936b17 (2 commits) (flutter/engine#12129)

https://skia.googlesource.com/skia.git/+log/1bf30ce852e0..9e5c47936b17

git log 1bf30ce852e0..9e5c47936b17 --date=short --no-merges --format='%ad %ae %s'
2019-09-10 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 a7ff7df26f28..58c5b07b47cf (7 commits)
2019-09-10 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps

Created with:
  gclient setdep -r src/third_party/skia@9e5c47936b17

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 mtklein@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=mtklein@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': '1bf30ce852e0d230dbd0169d1194423fc4e2c61b',
+  'skia_revision': '9e5c47936b171e03978bfe2611e71157d34bc539',
 
   # 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: f68f6a5d9e714554e46933462d5f7aea
+Signature: 4bac335201fc51dc919a836cac15cde2
 
 UNUSED LICENSES: