IDL parser: override Attribute production from base IDL parser

Source/bindings/scripts/blink_idl_parser.py

Index: Source/bindings/scripts/blink_idl_parser.py
diff --git a/Source/bindings/scripts/blink_idl_parser.py b/Source/bindings/scripts/blink_idl_parser.py
index 592bf91393d840809235f0440d3308fb23b978cd..181646353d700ea8754d78d57b86aa282be5bddc 100644
--- a/Source/bindings/scripts/blink_idl_parser.py
+++ b/Source/bindings/scripts/blink_idl_parser.py
@@ -254,7 +254,13 @@ class BlinkIDLParser(IDLParser):
         # ExceptionFields, and Attribute removed from this rule.
         p[0] = p[1]
 
-    # [b47.1]
+    # [b47.1] FIXME: rename to ExceptionAttribute
+    def p_Attribute(self, p):
+        """Attribute : ReadOnly ATTRIBUTE Type identifier ';'"""
+        p[0] = self.BuildNamed('Attribute', p, 4,
+                               ListFromConcat(p[1], p[3]))
+
+    # [b47.2]
     def p_ExceptionOperation(self, p):
         """ExceptionOperation : Type identifier '(' ')' ';'"""
         # Needed to handle one case in DOMException.idl: