Makes it so mojom files don't need a module

mojo/public/bindings/pylib/parse/mojo_parser.py

 #!/usr/bin/env python
 # Copyright 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.
 
 """Generates a syntax tree from a Mojo IDL file."""
 
 
 import sys
 import os.path
@@ skipping 52 matching lines @@
 
 class Parser(object):
 
   def __init__(self, lexer, source, filename):
     self.tokens = lexer.tokens
     self.source = source
     self.filename = filename
 
   def p_root(self, p):
     """root : import root
-            | module"""
+            | module
+            | definitions"""
     if len(p) > 2:
       p[0] = _ListFromConcat(p[1], p[2])
     else:
-      p[0] = [p[1]]
+      if p[1][0] != 'MODULE':
+        p[0] = [('MODULE', '', p[1])]
+      else:
+        p[0] = [p[1]]
 
   def p_import(self, p):
     """import : IMPORT STRING_LITERAL"""
     # 'eval' the literal to strip the quotes.
     p[0] = ('IMPORT', eval(p[2]))
 
   def p_module(self, p):
     """module : MODULE NAME LBRACE definitions RBRACE"""
     p[0] = ('MODULE', p[2], p[4])
 
@@ skipping 270 matching lines @@
         print Parse(f.read(), filename)
       except ParseError, e:
         print e
         return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))