Roll src/third_party/skia 6153165d78f2..fdb2b7d53038 (2 commits) (flutter#14528)

https://skia.googlesource.com/skia.git/+log/6153165d78f2..fdb2b7d53038

git log 6153165d78f2..fdb2b7d53038 --date=short --first-parent --format='%ad %ae %s'
2019-12-17 herb@google.com Add more thread annotations to SkStrike
2019-12-17 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 d1860ea17e8e..5407aaa089ac (11 commits)

Created with:
  gclient setdep -r src/third_party/skia@fdb2b7d53038

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

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': '6153165d78f279dc58bf180c61228c9392a957c9',
+  'skia_revision': 'fdb2b7d530383d85956b883779209a0627cc275b',
 
   # 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: 86b77d5cbb35a4e65df1de808f3057fd
+Signature: c7db3bddaa0818856866314eda69dc8f
 
 UNUSED LICENSES: