Roll Skia from 7f9aa5a2c609 to 3b6b7478421b (7 revisions) (flutter#19246)

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': '7f9aa5a2c60901d1f95ef450d711ef1ba50249cc',
+  'skia_revision': '3b6b7478421b4819e0f5ea08c44d90818b2cd739',
 
   # 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: b16226cbdf2ec7baae0a628512ea3b93
+Signature: 7027a7b3e90829b9c88d03e390f9b984
 
 UNUSED LICENSES:
 
@@ -969,6 +969,7 @@ FILE: ../../../third_party/skia/bench/microbench.json
 FILE: ../../../third_party/skia/bench/skpbench.json
 FILE: ../../../third_party/skia/build/fuchsia/skqp/skqp.cmx
 FILE: ../../../third_party/skia/build/fuchsia/skqp/test_manifest.json
+FILE: ../../../third_party/skia/demos.skia.org/demos/hello_world/index.html
 FILE: ../../../third_party/skia/docker/binary-size/Dockerfile
 FILE: ../../../third_party/skia/docker/cmake-release/Dockerfile
 FILE: ../../../third_party/skia/docker/skia-build-tools/Dockerfile