Roll src/third_party/skia 3d8b9b834731..4ab4e641f151 (1 commits) (#13331)

https://skia.googlesource.com/skia.git/+log/3d8b9b834731..4ab4e641f151

git log 3d8b9b834731..4ab4e641f151 --date=short --no-merges --format='%ad %ae %s'
2019-10-24 bsalomon@google.com Narrow fix for creating BGRA backend texture from pixmaps on desktop GL.

Created with:
  gclient setdep -r src/third_party/skia@4ab4e641f151

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 michaelludwig@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=michaelludwig@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': '3d8b9b83473139977c3650d1dc60f736fd655f31',
+  'skia_revision': '4ab4e641f151a2adc9d644d9da42f452c3d4fdff',
 
   # 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: 3564df5b0cb98717f2b8d7beecbb8bec
+Signature: f886e42b4431f66b5b529cc0a243e367
 
 UNUSED LICENSES: