Roll src/third_party/skia 673a048b209c..70ebd9ca0616 (8 commits) (#7641)

https://skia.googlesource.com/skia.git/%2Blog/673a048b209c..70ebd9ca0616

git log 673a048b209cba89d4be8e6b8ad7e8a4195fb3cd..70ebd9ca0616f54450a38d4f0f952810595a441b --date=short --no-merges --format=%ad %ae %s
2019-01-30 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader d9e364cff12d..cda0cf9d8112 (3 commits)
2019-01-30 mtklein@google.com make third_party() static libraries
2019-01-30 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 915d4068a65c..fa7ca18f44ed (1 commits)
2019-01-30 jvanverth@google.com Fix up some event handling in MacOS
2019-01-30 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 85bd613c938c..d9e364cff12d (1 commits)
2019-01-30 bsalomon@google.com Avoid crash in wacky_yuv GMs with --preAbandonGpuContext
2019-01-30 reed@google.com remove breakText from docs
2019-01-28 benjaminwagner@google.com Update Linux Vulkan SDK to 1.1.97.0

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 (borenet@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': '673a048b209cba89d4be8e6b8ad7e8a4195fb3cd',
+  'skia_revision': '70ebd9ca0616f54450a38d4f0f952810595a441b',
 
   # 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: 8086a2826c9c26511d7bf904b55e08c4
+Signature: 9fbc0d30a3a9de96a9a329b406654e52
 
 UNUSED LICENSES: