Roll src/third_party/skia de7e074..7730d7c (2 commits) (flutter#9096)

https://skia.googlesource.com/skia.git
/%2Blog/de7e074e8190..7730d7c

git log de7e074..7730d7c --date=short --no-merges --format=%ad %ae %s
2019-05-28 [email protected] Revert "Change Metal to not take ownership of objects"
2019-05-27 [email protected] Revert "Update GrRTC to use GrFillRectOp::MakeGeneric"

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Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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Author: skia-flutter-autoroll

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': 'de7e074e819037b80c1c432217683ddf979b963c',
+  'skia_revision': '7730d7cb8fb220fd6f54e91b4ca4def7d68302cc',
 
   # 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: 14ed669cd2ded9c2384d31928a41739f
+Signature: 525270bca2854bbf9e8609bf36ee948a
 
 UNUSED LICENSES:
 
@@ -5363,7 +5363,6 @@ FILE: ../../../third_party/skia/include/core/SkTileMode.h
 FILE: ../../../third_party/skia/include/gpu/GrContextThreadSafeProxy.h
 FILE: ../../../third_party/skia/include/private/GrContext_Base.h
 FILE: ../../../third_party/skia/include/private/GrImageContext.h
-FILE: ../../../third_party/skia/include/private/GrMtlTypesPriv.h
 FILE: ../../../third_party/skia/include/private/GrRecordingContext.h
 FILE: ../../../third_party/skia/include/private/SkVx.h
 FILE: ../../../third_party/skia/modules/skottie/src/text/SkottieShaper.cpp
@@ -5416,7 +5415,6 @@ FILE: ../../../third_party/skia/src/gpu/effects/generated/GrOverrideInputFragmen
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlCommandBuffer.h
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlCommandBuffer.mm
 FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlDepthStencil.h
-FILE: ../../../third_party/skia/src/gpu/mtl/GrMtlTypesPriv.cpp
 FILE: ../../../third_party/skia/src/gpu/vk/GrVkSecondaryCBDrawContext.cpp
 FILE: ../../../third_party/skia/src/gpu/vk/GrVkSecondaryCBDrawContext.h
 FILE: ../../../third_party/skia/src/sksl/SkSLDefines.h