Mojo C++ bindings: provide data view for all object types.

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 5e65891ef5e0594e0d93a9a0f119f82aba168ecf..0b62e06156bf99b16936fe854567e9c096601d8f 100644
--- a/mojo/public/cpp/bindings/lib/string_serialization.h
+++ b/mojo/public/cpp/bindings/lib/string_serialization.h
@@ -60,7 +60,7 @@ struct Serializer<String, MaybeConstUserType> {
                           SerializationContext* context) {
     if (!input)
       return CallSetToNullIfExists<Traits>(output);
-    return Traits::Read(StringDataView(input), output);
+    return Traits::Read(StringDataView(input, context), output);
   }
 };