Roll src/third_party/skia 4d727ac..184a300 (5 commits) (#13306)

https://skia.googlesource.com/skia.git/+log/4d727acb2455..184a300a24d5

git log 4d727ac..184a300 --date=short --no-merges --format='%ad %ae %s'
2019-10-23 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 5335faa..d4affcd (9 commits)
2019-10-23 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-10-23 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-10-23 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 23f9c25..7738ed7 (3 commits)
2019-10-23 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/skia@184a300a24d5

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 michaelludwig@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=michaelludwig@google.com

Author: skia-flutter-autoroll

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': '4d727acb2455b0441778c2dfbae81d570a1ef6c9',
+  'skia_revision': '184a300a24d5a62aeb5159add27f2d317fbfd783',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: 488155fdf67724ae2bbfa58927861076
+Signature: b7b8263c85c9a66ff1f4cb5316efb620
 
 UNUSED LICENSES: