Roll src/third_party/skia c3ff97a98b74..50299de39976 (1 commits) (flutter/engine#13998)

https://skia.googlesource.com/skia.git/+log/c3ff97a98b74..50299de39976

git log c3ff97a98b74..50299de39976 --date=short --no-merges --format='%ad %ae %s'
2019-11-23 robertphillips@google.com Reland "Revert "Make FP optimizations helpers use SkAlphaType not GrColorType""

Created with:
  gclient setdep -r src/third_party/skia@50299de39976

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC robertphillips@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: robertphillips@google.com

DEPS

@@ -26,7 +26,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': 'c3ff97a98b74554854b5822797c6b7b431f4d8d2',
+  'skia_revision': '50299de39976ab7aff91f5867fe05429135baae6',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: d41f84acbe245ec2c36d88299851fa7d
+Signature: ec3b6c1721f9bb264779b28ba79af0be
 
 UNUSED LICENSES: