IDL: Generic Dictionary support in union types

Source/bindings/scripts/v8_types.py

Index: Source/bindings/scripts/v8_types.py
diff --git a/Source/bindings/scripts/v8_types.py b/Source/bindings/scripts/v8_types.py
index d116ffa41822861da917b2b67ab96c90f56666b2..5b7eac40f1914cc62ba2ce2cb19bb3944aaf53ee 100644
--- a/Source/bindings/scripts/v8_types.py
+++ b/Source/bindings/scripts/v8_types.py
@@ -728,6 +728,9 @@ def v8_conversion_type(idl_type, extended_attributes):
         raise 'Unrecognized TreatReturnedNullStringAs value: "%s"' % treat_returned_null_string_as
     if idl_type.is_basic_type or base_idl_type == 'ScriptValue':
         return base_idl_type
+    # Generic dictionary type
+    if base_idl_type == 'Dictionary':
+        return 'Dictionary'
 
     # Data type with potential additional includes
     add_includes_for_type(idl_type)
@@ -767,6 +770,8 @@ V8_SET_RETURN_VALUE = {
     'DOMWrapperForMainWorld': 'v8SetReturnValueForMainWorld(info, WTF::getPtr({cpp_value}))',
     'DOMWrapperFast': 'v8SetReturnValueFast(info, WTF::getPtr({cpp_value}), {script_wrappable})',
     'DOMWrapperDefault': 'v8SetReturnValue(info, {cpp_value})',
+    # Generic dictionary type
+    'Dictionary': 'v8SetReturnValue(info, {cpp_value})',
     # Union types or dictionaries
     'DictionaryOrUnion': 'v8SetReturnValue(info, result)',
 }
@@ -824,6 +829,7 @@ CPP_VALUE_TO_V8_VALUE = {
     'StringOrNull': '{cpp_value}.isNull() ? v8::Handle<v8::Value>(v8::Null({isolate})) : v8String({isolate}, {cpp_value})',
     'StringOrUndefined': '{cpp_value}.isNull() ? v8Undefined() : v8String({isolate}, {cpp_value})',
     # Special cases
+    'Dictionary': '{cpp_value}.v8Value()',
     'EventHandler': '{cpp_value} ? v8::Handle<v8::Value>(V8AbstractEventListener::cast({cpp_value})->getListenerObject(impl->executionContext())) : v8::Handle<v8::Value>(v8::Null({isolate}))',
     'ScriptValue': '{cpp_value}.v8Value()',
     'SerializedScriptValue': '{cpp_value} ? {cpp_value}->deserialize() : v8::Handle<v8::Value>(v8::Null({isolate}))',