make version of ts_mon compatible with appengine

infra_libs/ts_mon/common/http_metrics.py

Index: infra_libs/ts_mon/common/http_metrics.py
diff --git a/infra_libs/ts_mon/common/http_metrics.py b/infra_libs/ts_mon/common/http_metrics.py
new file mode 100644
index 0000000000000000000000000000000000000000..b974c5c11ee038bde9dca85102df9ed3a51ee938
--- /dev/null
+++ b/infra_libs/ts_mon/common/http_metrics.py
@@ -0,0 +1,18 @@
+# Copyright 2015 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.
+
+from infra_libs.ts_mon.common.metrics import CumulativeDistributionMetric
+from infra_libs.ts_mon.common.metrics import CounterMetric
+
+access_count = CounterMetric('gae/access/count')
+request_bytes = CumulativeDistributionMetric('http/request_bytes')
+response_bytes = CumulativeDistributionMetric('http/response_bytes')
+durations = CumulativeDistributionMetric('http/durations')
+response_status = CounterMetric('http/response_status')
+
+
+def _reset_for_testing():  # pragma: no cover
+  for metric in (access_count, request_bytes, response_bytes,
+  	             durations, response_status):
+    metric.reset()