Roll src/third_party/skia e409441aee0d..2c4ceca62d27 (1 commits) (flutter/engine#8238)

https://skia.googlesource.com/skia.git/%2Blog/e409441aee0d..2c4ceca62d27

git log e409441aee0d52e03046e62d00d139bda8eeba22..2c4ceca62d27ebd3617d91b94a0231030927f864 --date=short --no-merges --format=%ad %ae %s
2019-03-21 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 a532570a09b8..f455f7565a7a (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 (brianosman@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': 'e409441aee0d52e03046e62d00d139bda8eeba22',
+  'skia_revision': '2c4ceca62d27ebd3617d91b94a0231030927f864',
 
   # 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: 14500d28d88b48cabb202f50f14dfc34
+Signature: cf58986b48977bd842b1a0b26bc9186f
 
 UNUSED LICENSES: