Roll src/third_party/skia c6671be0ea75..c1a9feb6f06e (2 commits) (#8021)

https://skia.googlesource.com/skia.git/%2Blog/c6671be0ea75..c1a9feb6f06e

git log c6671be0ea75880626807c4c40792b2cb1301a39..c1a9feb6f06edc41cce044b7da4f5e4a2e5055a5 --date=short --no-merges --format=%ad %ae %s
2019-03-03 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 7761d0dc32ad..aae499d4d09d (42 commits)
2019-03-03 recipe-roller@chromium.org 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 (reed@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': 'c6671be0ea75880626807c4c40792b2cb1301a39',
+  'skia_revision': 'c1a9feb6f06edc41cce044b7da4f5e4a2e5055a5',
 
   # 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: 2b57e01df9555987af14385e5f1867f6
+Signature: 6c7bb3eabee8dc2bd7a4d99b27f9adb4
 
 UNUSED LICENSES: