Mojo C++ bindings: expose public <struct>DataView and StringDataView.

mojo/public/cpp/bindings/lib/string_serialization.h

Index: mojo/public/cpp/bindings/lib/string_serialization.h
diff --git a/mojo/public/cpp/bindings/lib/string_serialization.h b/mojo/public/cpp/bindings/lib/string_serialization.h
index 29c2da3056feb1f996bb3e066d7894eeead0cb99..98c96c0532c44e04446d919494f9050a32123e56 100644
--- a/mojo/public/cpp/bindings/lib/string_serialization.h
+++ b/mojo/public/cpp/bindings/lib/string_serialization.h
@@ -58,7 +58,7 @@ struct Serializer<String, MaybeConstUserType> {
   static bool Deserialize(String_Data* input,
                           UserType* output,
                           SerializationContext* context) {
-    return Traits::Read(input, output);
+    return Traits::Read(StringDataView(input), output);
   }
 };