Roll src/third_party/skia 8f37ce5b9f2c..279b65ddb5a3 (6 commits) (#7350)

https://skia.googlesource.com/skia.git/%2Blog/8f37ce5b9f2c..279b65ddb5a3

git log 8f37ce5b9f2c139e4bad8e14ed6b884c1510dffd..279b65ddb5a306cb05552a6adfd4f63a9e78fb45 --date=short --no-merges --format=%ad %ae %s
2018-12-28 halcanary@google.com SkPDF: clean up public header
2019-01-02 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 0c6672158c77..04ea03e4e1e1 (2 commits)
2019-01-02 kjlubick@google.com Add docker caches in more places
2019-01-02 fmalita@chromium.org [skottie] Derive most adapters from SkNVRefCnt
2019-01-02 brianosman@google.com Reland "Wide color support in AA Convex path renderer"
2019-01-02 kjlubick@google.com Remove extra semi-colons

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (bungeman@google.com), and stop
the roller if necessary.

DEPS

@@ -23,7 +23,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': '8f37ce5b9f2c139e4bad8e14ed6b884c1510dffd',
+  'skia_revision': '279b65ddb5a306cb05552a6adfd4f63a9e78fb45',
 
   # 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: f9629b3233cb0d1a572a20be729232f6
+Signature: 2e3b3c0acf638f5661ae1827f5fecd2d
 
 UNUSED LICENSES: