Roll src/third_party/skia 184a300a24d5..a12f6cbff348 (1 commits) (#13307)

https://skia.googlesource.com/skia.git/+log/184a300a24d5..a12f6cbff348

git log 184a300a24d5..a12f6cbff348 --date=short --no-merges --format='%ad %ae %s'
2019-10-23 kjlubick@google.com [fuzzing] Fix skdescriptor deserialize compile

Created with:
  gclient setdep -r src/third_party/skia@a12f6cbff348

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

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': '184a300a24d5a62aeb5159add27f2d317fbfd783',
+  'skia_revision': 'a12f6cbff348f063237a12325e2b0f2008310613',
 
   # 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: b7b8263c85c9a66ff1f4cb5316efb620
+Signature: df2665950af5021b304104f0e2e10515
 
 UNUSED LICENSES: