Port messages sent by WebIDBDatabaseImpl to Mojo.

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

Index: mojo/public/cpp/bindings/lib/handle_interface_serialization.h
diff --git a/mojo/public/cpp/bindings/lib/handle_interface_serialization.h b/mojo/public/cpp/bindings/lib/handle_interface_serialization.h
index ecfb5bb5fedc476866d477ca5f675034c90d434a..8b26d84b64ba5657210b4e5b9fcf6bfbc5eef538 100644
--- a/mojo/public/cpp/bindings/lib/handle_interface_serialization.h
+++ b/mojo/public/cpp/bindings/lib/handle_interface_serialization.h
@@ -30,8 +30,10 @@ struct Serializer<AssociatedInterfacePtrInfoDataView<Base>,
                         AssociatedInterface_Data* output,
                         SerializationContext* context) {
     DCHECK(!input.handle().is_valid() || !input.handle().is_local());
-    DCHECK_EQ(input.handle().group_controller(),
-              context->group_controller.get());
+    if (input.handle().is_valid()) {
+      DCHECK_EQ(input.handle().group_controller(),
+                context->group_controller.get());
+    }
     output->version = input.version();
     output->interface_id = input.PassHandle().release();
   }
@@ -55,8 +57,10 @@ struct Serializer<AssociatedInterfaceRequestDataView<Base>,
                         AssociatedInterfaceRequest_Data* output,
                         SerializationContext* context) {
     DCHECK(!input.handle().is_valid() || !input.handle().is_local());
-    DCHECK_EQ(input.handle().group_controller(),
-              context->group_controller.get());
+    if (input.handle().is_valid()) {
+      DCHECK_EQ(input.handle().group_controller(),
+                context->group_controller.get());
+    }
     output->interface_id = input.PassHandle().release();
   }