Roll src/third_party/skia 1409ac718693..8f37ce5b9f2c (2 commits) (#7349)

https://skia.googlesource.com/skia.git/%2Blog/1409ac718693..8f37ce5b9f2c

git log 1409ac718693a6db962785b09e59eeb3b90b20f5..8f37ce5b9f2c139e4bad8e14ed6b884c1510dffd --date=short --no-merges --format=%ad %ae %s
2018-12-28 halcanary@google.com SkPDF: clean up
2018-12-21 halcanary@google.com SkPDF: wait for jobs to complete on abort()

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 (bungeman@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': '1409ac718693a6db962785b09e59eeb3b90b20f5',
+  'skia_revision': '8f37ce5b9f2c139e4bad8e14ed6b884c1510dffd',
 
   # 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: 8e36518642645fcf1743e622d26ca1ae
+Signature: f9629b3233cb0d1a572a20be729232f6
 
 UNUSED LICENSES: