Update from https://crrev.com/316786

tools/idl_parser/idl_parser.py

 #!/usr/bin/env python
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """ Parser for PPAPI IDL """
 
 #
 # IDL Parser
 #
@@ skipping 211 matching lines @@
   def p_CallbackRestOrInterface(self, p):
     """CallbackRestOrInterface : CallbackRest
                                | Interface"""
     p[0] = p[1]
 
   # [5]
   def p_Interface(self, p):
     """Interface : INTERFACE identifier Inheritance '{' InterfaceMembers '}' ';'"""
     p[0] = self.BuildNamed('Interface', p, 2, ListFromConcat(p[3], p[5]))
 
+  # [5.1] Error recovery for interface.
+  def p_InterfaceError(self, p):
+    """Interface : INTERFACE identifier Inheritance '{' error"""
+    p[0] = self.BuildError(p, 'Interface')
+
   # [6]
   def p_Partial(self, p):
     """Partial : PARTIAL PartialDefinition"""
     p[2].AddChildren(self.BuildTrue('Partial'))
     p[0] = p[2]
 
   # [6.1] Error recovery for Partial
   def p_PartialError(self, p):
     """Partial : PARTIAL error"""
     p[0] = self.BuildError(p, 'Partial')
@@ skipping 956 matching lines @@
 
   print '\n'.join(ast.Tree(accept_props=['PROD']))
   if errors:
     print '\nFound %d errors.\n' % errors
 
   return errors
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))