Roll src/third_party/skia c76ac8e325c7..77742c350371 (1 commits) (#14576)

https://skia.googlesource.com/skia.git/+log/c76ac8e325c7..77742c350371

git log c76ac8e325c7..77742c350371 --date=short --first-parent --format='%ad %ae %s'
2019-12-19 brianosman@google.com Remove SkShader.Empty from CanvasKit

Created with:
  gclient setdep -r src/third_party/skia@77742c350371

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 borenet@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: borenet@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': 'c76ac8e325c7f22e6d0f87bd110dc525a8938ca0',
+  'skia_revision': '77742c35037138fcdcde9a7c1d0743ce4409954c',
 
   # 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: 539e49cb119b0cd129ce33f973bd149d
+Signature: 31b5f3029d0fe100a46adb2e89d271cf
 
 UNUSED LICENSES: