Roll Skia from 417743f806d1 to a7b7964a237a (19 revisions) (flutter#23464)

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': '417743f806d1ea23d69a474e08ef8b2ba5a6927c',
+  'skia_revision': 'a7b7964a237a06feb74d1204bf87e16f094de63d',
 
   # 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: cd5f9973a2b4118c9ae106e78f84114f
+Signature: 94154baed89e79733b994478b4f109c5
 
 UNUSED LICENSES:
 
@@ -3914,11 +3914,11 @@ FILE: ../../../third_party/skia/src/gpu/GrBlockAllocator.cpp
 FILE: ../../../third_party/skia/src/gpu/GrBlockAllocator.h
 FILE: ../../../third_party/skia/src/gpu/GrClipStack.cpp
 FILE: ../../../third_party/skia/src/gpu/GrClipStack.h
-FILE: ../../../third_party/skia/src/gpu/GrCommandBufferRef.h
 FILE: ../../../third_party/skia/src/gpu/GrDDLTask.cpp
 FILE: ../../../third_party/skia/src/gpu/GrDDLTask.h
 FILE: ../../../third_party/skia/src/gpu/GrManagedResource.cpp
 FILE: ../../../third_party/skia/src/gpu/GrPixmap.h
+FILE: ../../../third_party/skia/src/gpu/GrRefCnt.h
 FILE: ../../../third_party/skia/src/gpu/GrRenderTargetContext.h
 FILE: ../../../third_party/skia/src/gpu/GrRingBuffer.cpp
 FILE: ../../../third_party/skia/src/gpu/GrRingBuffer.h