Roll src/third_party/skia aa4f7f5..46e2d8d (1 commits) (#14156)

https://skia.googlesource.com/skia.git/+log/aa4f7f55829d..46e2d8d4a1ae

git log aa4f7f5..46e2d8d --date=short --first-parent --format='%ad %ae %s'
2019-12-06 borenet@google.com [infra] Use "mod download" and "install", not "get" in chrome_release_branch

Created with:
  gclient setdep -r src/third_party/skia@46e2d8d4a1ae

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 bsalomon@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: bsalomon@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': 'aa4f7f55829d1d600dcdd196f0d7accd4c4b1333',
+  'skia_revision': '46e2d8d4a1ae653af9de691f8497c9e5dd49637a',
 
   # 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: bdf22e71fb98405640221ab9e009258e
+Signature: 3d03c62c99c9e83c0b501a6e7f55fb92
 
 UNUSED LICENSES: