Roll src/third_party/skia da29d70f1a59..20eafffd2d2f (1 commits) (#13223)

https://skia.googlesource.com/skia.git/+log/da29d70f1a59..20eafffd2d2f

git log da29d70f1a59..20eafffd2d2f --date=short --no-merges --format='%ad %ae %s'
2019-10-18 herb@google.com Convert prepareForDrawing to glyph buffers

Created with:
  gclient setdep -r src/third_party/skia@20eafffd2d2f

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 csmartdalton@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=csmartdalton@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': 'da29d70f1a5911f95a193a6a3ba334680f1a6863',
+  'skia_revision': '20eafffd2d2fa3e966e05ba0ffd0a3256e9b9415',
 
   # 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: 762a7e2e7690411e446168e292175365
+Signature: 7f79d644d2fa9f5a6f51e35affa2b086
 
 UNUSED LICENSES: