Add AppStats support.

app.yaml

@@ -9,6 +9,7 @@ env_variables:
   OPPIA_VERSION: '1.0'
 
 builtins:
+- appstats: on
 - remote_api: on
 
 handlers:

appengine_config.py

@@ -0,0 +1,26 @@
+# Copyright 2013 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS-IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Configuration for App Engine."""
+
+__author__ = '[email protected] (Sean Lip)'
+
+
+appstats_CALC_RPC_COSTS = True
+
+
+def webapp_add_wsgi_middleware(app):
+    from google.appengine.ext.appstats import recording
+    app = recording.appstats_wsgi_middleware(app)
+    return app