Roll src/third_party/skia 2ccdd2bc1d01..d6c69d21635e (2 commits) (#7868)

https://skia.googlesource.com/skia.git/%2Blog/2ccdd2bc1d01..d6c69d21635e

git log 2ccdd2bc1d01566210bcba5fbac2a4bf31f15845..d6c69d21635e08acaaec167d77773e2557f8969a --date=short --no-merges --format=%ad %ae %s
2019-02-18 reed@google.com Experiment: always use doubles for setLength
2019-02-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 6d56209983a0..ee506c5149cb (152 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 (jvanverth@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': '2ccdd2bc1d01566210bcba5fbac2a4bf31f15845',
+  'skia_revision': 'd6c69d21635e08acaaec167d77773e2557f8969a',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: b61e30b036eb8bad2b3dcc6913ff6549
+Signature: 3a7446fe43e3d3b5c42ce6a573bd0d6d
 
 UNUSED LICENSES: