Roll src/third_party/skia cb52badca04a..86c48abc94f3 (4 commits) (#12294)

https://skia.googlesource.com/skia.git/+log/cb52badca04a..86c48abc94f3

git log cb52badca04a..86c48abc94f3 --date=short --no-merges --format='%ad %ae %s'
2019-09-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 b1580a276713..d32dae1bb37c (5 commits)
2019-09-16 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go deps
2019-09-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader adb0d51ca672..30847688f059 (2 commits)
2019-09-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 465489971eea..48c8f915e06e (416 commits)

Created with:
  gclient setdep -r src/third_party/skia@86c48abc94f3

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 brianosman@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=brianosman@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': 'cb52badca04a32ccb7935facce6f35abac7f62e3',
+  'skia_revision': '86c48abc94f387fd2897bdfc87c7cedcf138ad44',
 
   # 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: 2a735572c4cac461d6d9c80ab4ce2316
+Signature: ddf34213b664ff4a8f3d58580f249098
 
 UNUSED LICENSES: