Roll src/third_party/skia a1ab899e9e3f..2444c0e9aa23 (2 commits) (#8739)

https://skia.googlesource.com/skia.git
/%2Blog/a1ab899e9e3f..2444c0e9aa23

git log a1ab899e9e3f842825a342ee41863146e2ae86e4..2444c0e9aa23e28e866b1cea700d3f9699ae013b --date=short --no-merges --format=%ad %ae %s
2019-04-25 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 62e274e86c7e..1b0acbb5126e (7 commits)
2019-04-25 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 7d439e099c7a..ea73ef568188 (418 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 (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': 'a1ab899e9e3f842825a342ee41863146e2ae86e4',
+  'skia_revision': '2444c0e9aa23e28e866b1cea700d3f9699ae013b',
 
   # 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: 0265ecc71126218ba9054589118df9f6
+Signature: bcee53d962c1fe180e9f40cc3131dda3
 
 UNUSED LICENSES: