Roll src/third_party/skia 0a57971..fbc887d (1 commits) (#8037)

https://skia.googlesource.com/skia.git/%2Blog/0a57971f0544..fbc887df72ec

git log 0a57971..fbc887d --date=short --no-merges --format=%ad %ae %s
2019-03-05 reed@google.com Revert "Remove (unnecessary?) flush in RenderYUVAToRGBA"

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 (reed@google.com), and stop
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Author: skia-flutter-autoroll

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': '0a57971f054410af9f0b29e776b8f186540c7a1c',
+  'skia_revision': 'fbc887df72ec102843c009977b24ed5b4bb2fab1',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: 7a19060fde0d980ac4a36861c31ada7e
+Signature: 8ba8b757d4d23dc9e9b1a157dc7ca2e2
 
 UNUSED LICENSES: