Roll src/third_party/skia dbded16fadde..4f6eb15178d8 (7 commits) (flutter/engine#8922)

https://skia.googlesource.com/skia.git
/%2Blog/dbded16fadde..4f6eb15178d8

git log dbded16fadde7924ad23687ca13ad9134a60e7f8..4f6eb15178d80041c296a665749932b608573bf1 --date=short --no-merges --format=%ad %ae %s
2019-05-09 fmalita@chromium.org [skottie] Add resize-to-fit text alignment extension
2019-05-09 rmistry@google.com [Android compile bot] Display returned infra error from bot
2019-05-09 bsalomon@google.com Revert "Large circle clipping gm."
2019-05-09 bsalomon@google.com Reland "Add flush() to SkImage."
2019-05-09 bsalomon@google.com Large circle clipping gm.
2019-05-09 bsalomon@google.com Revert "Add flush() to SkImage."
2019-05-09 bsalomon@google.com Add flush() to SkImage.

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 (robertphillips@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': 'dbded16fadde7924ad23687ca13ad9134a60e7f8',
+  'skia_revision': '4f6eb15178d80041c296a665749932b608573bf1',
 
   # 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: f5169aea7c3910c3ec05f7984b301b64
+Signature: c1b24ba3a7f3ce62d19b363c23120c45
 
 UNUSED LICENSES: