Roll src/third_party/skia d7639aff1001..ea6da6909624 (7 commits) (#9907)

https://skia.googlesource.com/skia.git
/compare/d7639aff1001..ea6da6909624

git log d7639aff1001736bc6072da539b31f911bb3788a..ea6da6909624bc000dbdb235b413f7c7b94d28b3 --date=short --no-merges --format=%ad %ae %s
2019-07-18 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 763b77946e17..ee98b422d004 (3 commits)
2019-07-17 michaelludwig@google.com Improve image-filter sample layout/rendering
2019-07-17 michaelludwig@google.com First pass at ImageFilter DAG visualizer sample
2019-07-17 mtklein@google.com refactor Program building
2019-07-17 egdaniel@google.com Move FormatType from ConfigInfo to FormatInfo.
2019-07-17 robertphillips@google.com Revamp pixelformat table for Metal
2019-07-17 robertphillips@google.com Make rest of GrGpu::wrapBackend* methods take a GrColorType

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 (nifong@google.com), and stop
the roller if necessary.

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': 'd7639aff1001736bc6072da539b31f911bb3788a',
+  'skia_revision': 'ea6da6909624bc000dbdb235b413f7c7b94d28b3',
 
   # 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: f05c70f0a20aced6c42d0455c9b7f151
+Signature: 223f193d19e29b1068d5217c1b697d3c
 
 UNUSED LICENSES:
 
@@ -4816,6 +4816,7 @@ FILE: ../../../third_party/skia/modules/particles/src/SkParticleAffector.cpp
 FILE: ../../../third_party/skia/modules/particles/src/SkParticleDrawable.cpp
 FILE: ../../../third_party/skia/modules/particles/src/SkParticleEffect.cpp
 FILE: ../../../third_party/skia/modules/particles/src/SkReflected.cpp
+FILE: ../../../third_party/skia/samplecode/SampleImageFilterDAG.cpp
 FILE: ../../../third_party/skia/src/core/SkColorFilterPriv.h
 FILE: ../../../third_party/skia/src/core/SkVM.cpp
 FILE: ../../../third_party/skia/src/core/SkVM.h