Roll src/third_party/skia 977b16d9c978..f153e221140a (3 commits) (#8696)

https://skia.googlesource.com/skia.git/%2Blog/977b16d9c978..f153e221140a

git log 977b16d9c978f85007613cd0ed05eef6ad0e169e..f153e221140adb32b91cbbc45e1f05d08f4fee0c --date=short --no-merges --format=%ad %ae %s
2019-04-23 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update go_deps asset
2019-04-23 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 c467f7b54188..cff6f150eae1 (1 commits)
2019-04-23 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 3ed0f75776bb..29e17ed23dea (265 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': '977b16d9c978f85007613cd0ed05eef6ad0e169e',
+  'skia_revision': 'f153e221140adb32b91cbbc45e1f05d08f4fee0c',
 
   # 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: 38a1d45e8703dd7d13f48dba89fb1fb4
+Signature: ddd5a659a5e329ab4e0c1630af32b3d8
 
 UNUSED LICENSES: