Update mojo sdk to rev 1dc8a9a5db73d3718d99917fadf31f5fb2ebad4f

third_party/mojo/src/mojo/public/interfaces/bindings/tests/BUILD.gn

Index: third_party/mojo/src/mojo/public/interfaces/bindings/tests/BUILD.gn
diff --git a/third_party/mojo/src/mojo/public/interfaces/bindings/tests/BUILD.gn b/third_party/mojo/src/mojo/public/interfaces/bindings/tests/BUILD.gn
index 5cdbda1b1df82a986d826a2b66912c55c49da6b1..9bf206cfa42d22768361add17edc16d5c79ac068 100644
--- a/third_party/mojo/src/mojo/public/interfaces/bindings/tests/BUILD.gn
+++ b/third_party/mojo/src/mojo/public/interfaces/bindings/tests/BUILD.gn
@@ -23,15 +23,24 @@ mojom("test_interfaces") {
   ]
 }
 
-mojom("versioning_test_service_interfaces") {
+mojom("test_interfaces_experimental") {
   testonly = true
   sources = [
+    "test_unions.mojom",
+  ]
+}
+
+mojom("versioning_test_service_interfaces") {
+  # FIXME: Dart packaged applications cannot depend on testonly mojoms.
+  # testonly = true
+  sources = [
     "versioning_test_service.mojom",
   ]
 }
 
 mojom("versioning_test_client_interfaces") {
-  testonly = true
+  # FIXME: Dart packaged applications cannot depend on testonly mojoms.
+  # testonly = true
   sources = [
     "versioning_test_client.mojom",
   ]