Add WebIDL compliant parser plus tests

tools/idl_parser/idl_lexer.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.
 
 """ Lexer for PPAPI IDL
 
 The lexer uses the PLY library to build a tokenizer which understands both
 WebIDL and Pepper tokens.
 
@@ skipping 211 matching lines @@
   def GetTokens(self):
     outlist = []
     while True:
       t = self.lexobj.token()
       if not t:
         break
       outlist.append(t)
     return outlist
 
   def Tokenize(self, data, filename='__no_file__'):
+    self.lexobj.lineno = 1
     self.lexobj.filename = filename
     self.lexobj.input(data)
     self.lines = data.split('\n')
 
   def __init__(self):
     self.index = [0]
     self._lex_errors = 0
     self.linex = []
     self.filename = None
     self.lexobj = lex.lex(object=self, lextab=None, optimize=0)