Roll src/third_party/skia bf341ae88c83..cec20280b3fb (3 commits) (#8320)

https://skia.googlesource.com/skia.git/%2Blog/bf341ae88c83..cec20280b3fb

git log bf341ae88c83155752e3a2080bb40cefbbbaf32b..cec20280b3fb818e3be9a07ef585983c17329a2a --date=short --no-merges --format=%ad %ae %s
2019-03-27 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 a47e2a23ab4c..518c679da109 (3 commits)
2019-03-27 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 4035f6c897d0..83d44af5c208 (535 commits)
2019-03-26 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (stani@google.com), and stop
the roller if necessary.

DEPS

@@ -23,7 +23,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': 'bf341ae88c83155752e3a2080bb40cefbbbaf32b',
+  'skia_revision': 'cec20280b3fb818e3be9a07ef585983c17329a2a',
 
   # 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: 1a4cc863926e17f6e4ee31d49a84954b
+Signature: 4483f2de15dffb85d88bd33110514876
 
 UNUSED LICENSES: