Dart: Fixes enum array encoding

mojo/dart/unittests/embedder_tests/bindings_generation_test.dart

Index: mojo/dart/unittests/embedder_tests/bindings_generation_test.dart
diff --git a/mojo/dart/unittests/embedder_tests/bindings_generation_test.dart b/mojo/dart/unittests/embedder_tests/bindings_generation_test.dart
index 92668d51eb5ffffee702341d3bb182c8b7370e0e..b6fb43c33dbbb446188ce97efa9e99415b862d24 100644
--- a/mojo/dart/unittests/embedder_tests/bindings_generation_test.dart
+++ b/mojo/dart/unittests/embedder_tests/bindings_generation_test.dart
@@ -245,6 +245,22 @@ testUnionsToString() {
   Expect.equals("PodUnion(fUint32: 32)", podUnion.toString());
 }
 
+testSerializeEnumArray() {
+  var s = new regression.ContainsNullableArrayOfEnum();
+  s.arrayOfEnums = [
+    regression.NormalEnum.first,
+    regression.NormalEnum.second,
+    regression.NormalEnum.second,
+    regression.NormalEnum.first,
+  ];
+
+  var message = messageOfStruct(s);
+  var s2 = regression.ContainsNullableArrayOfEnum.deserialize(message.payload);
+  for (int i = 0; i < s.arrayOfEnums.length; i++) {
+    Expect.equals(s.arrayOfEnums[i], s2.arrayOfEnums[i]);
+  }
+}
+
 testUnions() {
   testSerializePodUnions();
   testSerializeStructInUnion();
@@ -254,6 +270,7 @@ testUnions() {
   testSerializeUnionInMap();
   testSerializeUnionInUnion();
   testUnionsToString();
+  testSerializeEnumArray();
 }
 
 class CheckEnumCapsImpl implements regression.CheckEnumCaps {