Roll src/third_party/skia 8d1b0bc..ef0406f (8 commits) (#10954)

https://skia.googlesource.com/skia.git/+log/8d1b0bceedd6..ef0406f04761

git log 8d1b0bc..ef0406f --date=short --no-merges --format='%ad %ae %s'
2019-08-12 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-08-12 mtklein@google.com inline helpers in SkDashPath.cpp cull_path()
2019-08-12 mtklein@google.com add GM for skbug.com/9331
2019-08-12 egdaniel@google.com For non-ccpr draws make sure all inputs to GrGPUCommandBuffer are long lived.
2019-08-12 halcanary@google.com gm: GMFactory returns a unique_ptr<>
2019-08-12 bsalomon@google.com Remove some uses of GrSurface::config()
2019-08-12 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-08-12 halcanary@google.com SkMetaData: drop unused pointer ownership

Created with:
  gclient setdep -r src/third_party/skia@ef0406f04761

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, who should
be CC'd on the roll, and stop the roller if necessary.


Bug: None
TBR=scroggo@google.com

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': '8d1b0bceedd630e6915f4c9eb518f4fdc583337f',
+  'skia_revision': 'ef0406f04761241c30ea76410d775e4c03d3e24c',
 
   # 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: 5eb9d97890c6bc943cf24dbe4c0cd1ac
+Signature: d02bfd8bbdfbfe3cda0434ac6f49d0ce
 
 UNUSED LICENSES:
 
@@ -4902,6 +4902,7 @@ FILE: ../../../third_party/skia/experimental/ffmpeg/SkVideoEncoder.cpp
 FILE: ../../../third_party/skia/experimental/ffmpeg/SkVideoEncoder.h
 FILE: ../../../third_party/skia/gm/backdrop.cpp
 FILE: ../../../third_party/skia/gm/backdrop_imagefilter_croprect.cpp
+FILE: ../../../third_party/skia/gm/bug9331.cpp
 FILE: ../../../third_party/skia/gm/collapsepaths.cpp
 FILE: ../../../third_party/skia/gm/compositor_quads.cpp
 FILE: ../../../third_party/skia/gm/crbug_913349.cpp