Roll src/third_party/skia ff7006ff8082..ad1a0ca8be29 (4 commits) (#8750)

https://skia.googlesource.com/skia.git
/%2Blog/ff7006ff8082..ad1a0ca8be29

git log ff7006ff8082a6f4298cc9f32acc726535d93711..ad1a0ca8be29c1d57e24aba149c2d6c251395f89 --date=short --no-merges --format=%ad %ae %s
2019-04-25 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-25 reed@google.com stage naming change in colorfilter
2019-04-25 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-25 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com 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 (mtklein@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': 'ff7006ff8082a6f4298cc9f32acc726535d93711',
+  'skia_revision': 'ad1a0ca8be29c1d57e24aba149c2d6c251395f89',
 
   # 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: 6aa2d6440b18c4be9d082275e2dd8ab7
+Signature: d481e79113a128510097489d3b693bc2
 
 UNUSED LICENSES: