Roll src/third_party/skia 3dc21675b05a..a5d2a9486fed (1 commits) (#7330)

https://skia.googlesource.com/skia.git/%2Blog/3dc21675b05a..a5d2a9486fed

git log 3dc21675b05a0b43ce103b89b1f780651df8da3a..a5d2a9486fede1701729f86f8387f0465dcb412a --date=short --no-merges --format=%ad %ae %s
2018-12-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 3f01f53c02e8..8c78ce4bd30c (4 commits)

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 (robertphillips@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': '3dc21675b05a0b43ce103b89b1f780651df8da3a',
+  'skia_revision': 'a5d2a9486fede1701729f86f8387f0465dcb412a',
 
   # 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: 59011fe4ad852782153ea9e9a8bbe5fe
+Signature: 909a4f92175a9ca319f110ca79e48738
 
 UNUSED LICENSES: