[mojo] Add Mojo bindings support for IPC::ParamTraits

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

Index: mojo/public/cpp/bindings/lib/map_serialization.h
diff --git a/mojo/public/cpp/bindings/lib/map_serialization.h b/mojo/public/cpp/bindings/lib/map_serialization.h
index 6874fbe5aeda80318f07eca8280157804930823a..0a5c8fb178d221003e07d15fbe29e28422dc656c 100644
--- a/mojo/public/cpp/bindings/lib/map_serialization.h
+++ b/mojo/public/cpp/bindings/lib/map_serialization.h
@@ -162,7 +162,7 @@ template <typename MapKey,
           typename MapValue,
           typename DataKey,
           typename DataValue>
-inline void Deserialize_(internal::Map_Data<DataKey, DataValue>* input,
+inline bool Deserialize_(internal::Map_Data<DataKey, DataValue>* input,
                          Map<MapKey, MapValue>* output,
                          internal::SerializationContext* context) {
   if (input) {
@@ -170,12 +170,14 @@ inline void Deserialize_(internal::Map_Data<DataKey, DataValue>* input,
     Array<MapValue> values;
 
     Deserialize_(input->keys.ptr, &keys, context);
-    Deserialize_(input->values.ptr, &values, context);
+    if (!Deserialize_(input->values.ptr, &values, context))
+      return false;
 
     *output = Map<MapKey, MapValue>(keys.Pass(), values.Pass());
   } else {
     output->reset();
   }
+  return true;
 }
 
 }  // namespace mojo