Policy: Add ProxyMode and deprecate ProxyServerMode.

tools/grit/grit/format/policy_templates/writers/json_writer.py

Index: tools/grit/grit/format/policy_templates/writers/json_writer.py
diff --git a/tools/grit/grit/format/policy_templates/writers/json_writer.py b/tools/grit/grit/format/policy_templates/writers/json_writer.py
index 8a6e35f9fc343924c73a89ae193074cc259f63b5..bc52ed14a56500461b53e62d29ca3a11f749f0a0 100644
--- a/tools/grit/grit/format/policy_templates/writers/json_writer.py
+++ b/tools/grit/grit/format/policy_templates/writers/json_writer.py
@@ -39,8 +39,10 @@ class JsonWriter(template_writer.TemplateWriter):
         example_value_str = 'true'
       else:
         example_value_str = 'false'
-    elif policy['type'] == 'enum':
-      example_value_str = example_value
+    elif policy['type'] == 'string-enum':
+      example_value_str = '"%s"' % example_value;
+    elif policy['type'] == 'int-enum':
+      example_value_str = str(example_value)
     else:
       raise Exception('unknown policy type %s:' % policy['type'])