Create response_parameters as part of mojom

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

Index: mojo/public/bindings/pylib/parse/mojo_translate.py
diff --git a/mojo/public/bindings/pylib/parse/mojo_translate.py b/mojo/public/bindings/pylib/parse/mojo_translate.py
index 4ba0d142d65632e922b5d652ff525fa6bbdef9cd..c8d322fd42fbcf53b5d1b3621a05bb87d9bb1432 100755
--- a/mojo/public/bindings/pylib/parse/mojo_translate.py
+++ b/mojo/public/bindings/pylib/parse/mojo_translate.py
@@ -81,9 +81,12 @@ class MojomBuilder():
     if methods:
       for method in methods:
         if method[0] == 'METHOD':
-          out.append({'name': method[1],
-                      'parameters': self.MapParameters(method[2]),
-                      'ordinal': self.MapOrdinal(method[3])})
+          method_dict = {'name': method[1],
+                         'parameters': self.MapParameters(method[2]),
+                         'ordinal': self.MapOrdinal(method[3])}
+          if method[4] != None:
+            method_dict['response_parameters'] = self.MapParameters(method[4])
+          out.append(method_dict)
     return out