make version of ts_mon compatible with appengine

appengine_module/gae_ts_mon/metrics.py

 # Copyright 2015 The Chromium Authors. All rights reserved.

[agable, 2015/08/10 23:04:38]

I realize the imports are different, but: See if there's a way you can put this
file into ts_mon/common and symlink it. Since none of the Metric classes
themselves need to be modified for appengine, it's a shame to have to copy-paste
all the code here.

 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Classes representing individual metrics that can be sent."""
 
 
 import copy
 import threading
 import time
 
-from monacq.proto import metrics_pb2
+import interface
+from gae import distribution
+from gae import errors
 
-from infra_libs.ts_mon import distribution
-from infra_libs.ts_mon import errors
-from infra_libs.ts_mon import interface
+from proto import metrics_pb2
 
 
 MICROSECONDS_PER_SECOND = 1000000
 
 
 class Metric(object):
   """Abstract base class for a metric.
 
   A Metric is an attribute that may be monitored across many targets. Examples
   include disk usage or the number of requests a server has received. A single
@@ skipping 398 matching lines @@
 
   def __init__(
       self, name, bucketer=None, target=None, fields=None, time_fn=time.time):
     super(NonCumulativeDistributionMetric, self).__init__(
         name,
         is_cumulative=False,
         bucketer=bucketer,
         target=target,
         fields=fields,
         time_fn=time_fn)