Roll src/third_party/skia a28cf7c08061..902cf1e12a74 (4 commits) (#12994)

https://skia.googlesource.com/skia.git/+log/a28cf7c08061..902cf1e12a74

git log a28cf7c08061..902cf1e12a74 --date=short --no-merges --format='%ad %ae %s'
2019-10-08 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 5e9d4ee99ea1..a333b87cfcbe (8 commits)
2019-10-08 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-10-08 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 036463457e5f..ae022faf53b9 (2 commits)
2019-10-08 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 78225ef2ba10..5c41949c8fc4 (382 commits)

Created with:
  gclient setdep -r src/third_party/skia@902cf1e12a74

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 kjlubick@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=kjlubick@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': 'a28cf7c08061ba927b39e4605f4966a4c8f2ae26',
+  'skia_revision': '902cf1e12a74e0f4d28ca6089aaecfda63e3b728',
 
   # 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: f95ed97a92394e56753cc31dd4c9a4ef
+Signature: 5b6705be3d560922364844f2a6461957
 
 UNUSED LICENSES: