gae_ts_mon: instrument Cloud Endpoint methods

infra_libs/ts_mon/common/interface.py

 # 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.
 
 """Classes representing the monitoring interface for tasks or devices.
 
 Usage:
   import argparse
   from infra_libs import ts_mon
 
@@ skipping 115 matching lines @@
   del state.metrics[metric.name]
 
 
 def close():
   """Stops any background threads and waits for them to exit."""
   if state.flush_thread is not None:
     state.flush_thread.stop()
 
 
 def reset_for_unittest():
+  global state
+  store = state.store
+  state = State()
+  state.store = store
   state.store.reset_for_unittest()
 
 
 class _FlushThread(threading.Thread):
   """Background thread that flushes metrics on an interval."""
 
   def __init__(self, interval_secs, stop_event=None):
     super(_FlushThread, self).__init__(name='ts_mon')
 
     if stop_event is None:
@@ skipping 31 matching lines @@
             'Last monitoring flush took %f seconds (longer than '
             '--ts-mon-flush-interval-secs = %f seconds)',
             flush_duration, self.interval_secs)
         next_timeout = 0
 
   def stop(self):
     """Stops the background thread and performs a final flush."""
 
     self.stop_event.set()
     self.join()