Roll src/third_party/skia 6791ee2f8059..d445e2b6fcf1 (1 commits) (flutter#15148)

https://skia.googlesource.com/skia.git/+log/6791ee2f8059..d445e2b6fcf1

git log 6791ee2f8059..d445e2b6fcf1 --date=short --first-parent --format='%ad %ae %s'
2020-01-05 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update SKP version

Created with:
  gclient setdep -r src/third_party/skia@d445e2b6fcf1

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 jvanverth@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: jvanverth@google.com

Author: skia-flutter-autoroll

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': '6791ee2f8059c6b395e116011fb8e68621cebe6c',
+  'skia_revision': 'd445e2b6fcf1a051049b2e527feb1fca9a0a4946',
 
   # 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: 436cc8b3ba6a55cf0460ae23489d29e1
+Signature: 52d5a1113113fcff5f331b122101a0a0
 
 UNUSED LICENSES: