Roll src/third_party/skia 46d0f9aad1e6..a1ab899e9e3f (2 commits) (#8737)

https://skia.googlesource.com/skia.git
/%2Blog/46d0f9aad1e6..a1ab899e9e3f

git log 46d0f9aad1e68b90774315ad09abe55dd8fe2fd9..a1ab899e9e3f842825a342ee41863146e2ae86e4 --date=short --no-merges --format=%ad %ae %s
2019-04-24 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-24 fmalita@chromium.org [skottie] Fix 3d rotation order

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': '46d0f9aad1e68b90774315ad09abe55dd8fe2fd9',
+  'skia_revision': 'a1ab899e9e3f842825a342ee41863146e2ae86e4',
 
   # 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: 76c6fbd8e758da7a47b1749b03d73fa4
+Signature: 0265ecc71126218ba9054589118df9f6
 
 UNUSED LICENSES: