Implement python mojo bindings unions.

mojo/public/tools/bindings/generators/python_templates/module.py.tmpl

Index: mojo/public/tools/bindings/generators/python_templates/module.py.tmpl
diff --git a/mojo/public/tools/bindings/generators/python_templates/module.py.tmpl b/mojo/public/tools/bindings/generators/python_templates/module.py.tmpl
index 2a229327b71301a4ce0658a902cd70a9cfbdb455..72d1928a8b3af45b61f673ebc07b84ae25d22ac9 100644
--- a/mojo/public/tools/bindings/generators/python_templates/module.py.tmpl
+++ b/mojo/public/tools/bindings/generators/python_templates/module.py.tmpl
@@ -1,5 +1,6 @@
 {% from "module_macros.tmpl" import enum_values %}
 {% from "module_macros.tmpl" import struct_descriptor %}
+{% from "module_macros.tmpl" import union_descriptor %}
 # Copyright 2014 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.
@@ -34,6 +35,13 @@ class {{struct|name}}(object):
   __metaclass__ = _reflection.MojoStructType
   DESCRIPTOR = {{struct_descriptor(struct)|indent(2)}}
 {% endfor %}
+
+{% for union in unions %}

[qsr, 2015/07/16 09:35:26]

Remove the space before the for loop, and add it after. Right now, if you have
multiple unions, they are not separated, and if you have none, you have 2 blank
lines.

[azani, 2015/07/16 21:57:39]

Done.

+class {{union|name}}(object):
+  __metaclass__ = _reflection.MojoUnionType
+  DESCRIPTOR = {{union_descriptor(union)|indent(2)}}
+{% endfor %}
+
 {% for interface in interfaces %}
 
 class {{interface|name}}(object):
@@ -55,3 +63,4 @@ class {{interface|name}}(object):
     ],
   }
 {% endfor %}
+

[qsr, 2015/07/16 09:35:26]

Why this blank line?

[azani, 2015/07/16 21:57:39]

Done.