Roll src/third_party/skia 634d15032d37..7274850f96f2 (3 commits) (flutter#13165)

https://skia.googlesource.com/skia.git/+log/634d15032d37..7274850f96f2

git log 634d15032d37..7274850f96f2 --date=short --no-merges --format='%ad %ae %s'
2019-10-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 2d0e5b554d4f..0b9ebe58e380 (2 commits)
2019-10-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 083c52f74ac2..fbf280c2d283 (475 commits)
2019-10-16 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader a27dfcf868bf..9097eeb5359b (2 commits)

Created with:
  gclient setdep -r src/third_party/skia@7274850f96f2

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

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': '634d15032d37902e654fcc39ebcaa23b5fb9df90',
+  'skia_revision': '7274850f96f267f272d7336bdac5355de03f6a58',
 
   # 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: fd7e7e05349a8af3aae4d4633b3197e4
+Signature: 625a3b29ca3d2a69f44296ccf7fd35d0
 
 UNUSED LICENSES: