Roll src/third_party/skia be9aff25bddc..b7c7b7883b23 (17 commits) (#7852)

https://skia.googlesource.com/skia.git/%2Blog/be9aff25bddc..b7c7b7883b23

git log be9aff25bddc3eecf84d9c37af222ea40c261cb1..b7c7b7883b2377e55e5def16560b1429958e0ec3 --date=short --no-merges --format=%ad %ae %s
2019-02-15 herb@google.com Remove all empty glyph processing
2019-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 0eba65b14b60..a0a80b160c6b (1 commits)
2019-02-15 robertphillips@google.com Revert "Make asFragmentProcessor entry point only take a GrRecordingContext"
2019-02-15 reed@google.com make float more primary API for paint (esp. for alpha)
2019-02-15 halcanary@google.com tools/skqp/release.sh: Add Instant and ABI XML tags
2019-02-15 robertphillips@google.com Make asFragmentProcessor entry point only take a GrRecordingContext
2019-02-15 robertphillips@google.com Switch GrSurfaceProxy's Copy methods over to GrRecordingContext
2019-02-15 robertphillips@google.com Begin switching GrRecordingContext over to having the GrDrawingManager
2019-02-15 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 2bb0864b22e7..0eba65b14b60 (21 commits)
2019-02-15 robertphillips@google.com Add addOnFlushCallbackObject at GrRecordingContext level
2019-02-15 brianosman@google.com Moved image params out to SkParticleDrawable
2019-02-15 scroggo@google.com Remove assert that BGRA and RGBA are not opaque
2019-02-15 herb@google.com Revert of CL/192440 which would not reland cleanly.
2019-02-15 fmalita@chromium.org add mixer colorfilter
2019-02-13 csmartdalton@google.com Remove shader caps argument from GrGLSLTypeString
2019-02-15 robertphillips@google.com Stop using resourceProvider in GrRenderTargetContext's ctor
2019-02-15 halcanary@google.com ICU: enable on wasm

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 (stephana@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': 'be9aff25bddc3eecf84d9c37af222ea40c261cb1',
+  'skia_revision': 'b7c7b7883b2377e55e5def16560b1429958e0ec3',
 
   # 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: a5fd73a8d92635818c8fb0f596b19547
+Signature: ed2d1aa421644a29414ee77b0a91d235
 
 UNUSED LICENSES:
 
@@ -4329,6 +4329,7 @@ FILE: ../../../third_party/skia/modules/sksg/src/SkSGTrimEffect.cpp
 FILE: ../../../third_party/skia/samplecode/SampleCCPRGeometry.cpp
 FILE: ../../../third_party/skia/samplecode/SampleChineseFling.cpp
 FILE: ../../../third_party/skia/samplecode/SampleCowboy.cpp
+FILE: ../../../third_party/skia/samplecode/SampleMixer.cpp
 FILE: ../../../third_party/skia/samplecode/SamplePathText.cpp
 FILE: ../../../third_party/skia/samplecode/SampleShadowColor.cpp
 FILE: ../../../third_party/skia/samplecode/SampleShadowReference.cpp
@@ -4686,12 +4687,14 @@ FILE: ../../../third_party/skia/experimental/canvaskit/skottie_bindings.cpp
 FILE: ../../../third_party/skia/modules/particles/include/SkCurve.h
 FILE: ../../../third_party/skia/modules/particles/include/SkParticleAffector.h
 FILE: ../../../third_party/skia/modules/particles/include/SkParticleData.h
+FILE: ../../../third_party/skia/modules/particles/include/SkParticleDrawable.h
 FILE: ../../../third_party/skia/modules/particles/include/SkParticleEffect.h
 FILE: ../../../third_party/skia/modules/particles/include/SkParticleEmitter.h
 FILE: ../../../third_party/skia/modules/particles/include/SkParticleSerialization.h
 FILE: ../../../third_party/skia/modules/particles/include/SkReflected.h
 FILE: ../../../third_party/skia/modules/particles/src/SkCurve.cpp
 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/SkParticleEmitter.cpp
 FILE: ../../../third_party/skia/modules/particles/src/SkReflected.cpp