Roll src/third_party/skia c9f55de2ed39..3611ee1bb157 (1 commits) (flutter/engine#8577)

https://skia.googlesource.com/skia.git/%2Blog/c9f55de2ed39..3611ee1bb157

git log c9f55de2ed394b278b29c3b9bf686e3c30493734..3611ee1bb157469ab8f4904cd2261dfdc7dee6b6 --date=short --no-merges --format=%ad %ae %s
2019-04-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 13f230772370..64b761a8af9b (23 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 (herb@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': 'c9f55de2ed394b278b29c3b9bf686e3c30493734',
+  'skia_revision': '3611ee1bb157469ab8f4904cd2261dfdc7dee6b6',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 96fbf0f0f96f0968ed79fb4e1e5befbc
+Signature: fa8fc30feda951d7f5c45e648e058a72
 
 UNUSED LICENSES: