Implement sk_sp<SkImageFilter> StructTraits

skia/public/interfaces/image_filter.mojom

Index: skia/public/interfaces/image_filter.mojom
diff --git a/services/shell/background/tests/test.mojom b/skia/public/interfaces/image_filter.mojom
similarity index 60%
copy from services/shell/background/tests/test.mojom
copy to skia/public/interfaces/image_filter.mojom
index 18a92ec2634bed55b4048f5ece0e83b36f0c7b8f..4db9d20c0c7ded45b1c16c43c3dca13a767480be 100644
--- a/services/shell/background/tests/test.mojom
+++ b/skia/public/interfaces/image_filter.mojom
@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module shell.mojom;
+module skia.mojom;
 
-interface TestService {
-  Test() => ();
+// This struct contains a serialized SkImageFilter.
+struct ImageFilter {
+  array<uint8> data;
 };