IDL: Support using nullable on any method return type

Source/bindings/scripts/idl_definitions.py

Index: Source/bindings/scripts/idl_definitions.py
diff --git a/Source/bindings/scripts/idl_definitions.py b/Source/bindings/scripts/idl_definitions.py
index 75900355eca89100fba24d90c8022954f5674d3f..ab3b0c500df1f67c40d8160de7fa0c2a832dface 100644
--- a/Source/bindings/scripts/idl_definitions.py
+++ b/Source/bindings/scripts/idl_definitions.py
@@ -769,7 +769,8 @@ def type_node_inner_to_type(node, is_array=False, is_nullable=False):
     elif node_class == 'Sequence':
         if is_array:
             raise ValueError('Arrays of sequences are not supported')
-        return sequence_node_to_type(node, is_nullable=is_nullable)
+        sequence_is_nullable = node.GetProperty('NULLABLE') or False

[Jens Widell, 2014/07/10 14:31:13]

This fixes sequence<T>?; we previously used the NULLABLE property on a node that
never had it.

We still can't do sequence<T?>, but that type variant seems less useful to have
in an API. There's a FIXME in idl_types.py about restructuring type
representation to support sequence-of, array-of and nullable as independent
modifiers.

+        return sequence_node_to_type(node, is_nullable=sequence_is_nullable)
     elif node_class == 'UnionType':
         if is_array:
             raise ValueError('Arrays of unions are not supported')