DevTools: Async call stacks for window.postMessage()

Source/core/inspector/CodeGeneratorInstrumentation.py

 #!/usr/bin/env python
 # Copyright (c) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 229 matching lines @@
         # Splitting parameters by a comma, assuming that attribute lists contain no more than one attribute.
         self.params = map(Parameter, map(str.strip, match.group(4).split(",")))
 
         self.accepts_cookie = len(self.params) and self.params[0].type == "const InspectorInstrumentationCookie&"
         self.returns_cookie = self.return_type == "InspectorInstrumentationCookie"
 
         self.returns_value = self.return_type != "void"
 
         if self.return_type == "bool":
             self.default_return_value = "false"
+        elif self.return_type == "int":
+            self.default_return_value = "0"
         elif self.return_type == "String":
             self.default_return_value = "\"\""
         else:
             self.default_return_value = self.return_type + "()"
 
         for param in self.params:
             if "DefaultReturn" in param.options:
                 self.default_return_value = param.name
 
         self.params_impl = self.params
@@ skipping 262 matching lines @@
     if not output_dirpath:
         raise Exception("Output directory must be specified")
 except Exception:
     # Work with python 2 and 3 http://docs.python.org/py3k/howto/pyporting.html
     exc = sys.exc_info()[1]
     sys.stderr.write("Failed to parse command-line arguments: %s\n\n" % exc)
     sys.stderr.write("Usage: <script> --output_dir <output_dir> InspectorInstrumentation.idl\n")
     exit(1)
 
 generate(input_path, output_dirpath)