make version of ts_mon compatible with appengine

infra_libs/ts_mon/__init__.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.
 
 from infra_libs.ts_mon.config import add_argparse_options
 from infra_libs.ts_mon.config import process_argparse_options
 
-from infra_libs.ts_mon.distribution import Distribution
-from infra_libs.ts_mon.distribution import FixedWidthBucketer
-from infra_libs.ts_mon.distribution import GeometricBucketer
-
-from infra_libs.ts_mon.errors import MonitoringError
-from infra_libs.ts_mon.errors import MonitoringDecreasingValueError
-from infra_libs.ts_mon.errors import MonitoringDuplicateRegistrationError
-from infra_libs.ts_mon.errors import MonitoringIncrementUnsetValueError
-from infra_libs.ts_mon.errors import MonitoringInvalidFieldTypeError
-from infra_libs.ts_mon.errors import MonitoringInvalidValueTypeError
-from infra_libs.ts_mon.errors import MonitoringTooManyFieldsError
-from infra_libs.ts_mon.errors import MonitoringNoConfiguredMonitorError
-from infra_libs.ts_mon.errors import MonitoringNoConfiguredTargetError
-
-from infra_libs.ts_mon.helpers import ScopedIncrementCounter
+from infra_libs.ts_mon.monitors import ApiMonitor
+from infra_libs.ts_mon.monitors import DiskMonitor
+from infra_libs.ts_mon.monitors import NullMonitor
 
 from infra_libs.ts_mon.interface import close
 from infra_libs.ts_mon.interface import send
 from infra_libs.ts_mon.interface import flush
 from infra_libs.ts_mon.interface import register
 from infra_libs.ts_mon.interface import unregister
 
-from infra_libs.ts_mon.targets import DeviceTarget
-from infra_libs.ts_mon.targets import TaskTarget
-
 from infra_libs.ts_mon.metrics import BooleanMetric
 from infra_libs.ts_mon.metrics import CounterMetric
 from infra_libs.ts_mon.metrics import CumulativeMetric
 from infra_libs.ts_mon.metrics import DistributionMetric
 from infra_libs.ts_mon.metrics import FloatMetric
 from infra_libs.ts_mon.metrics import GaugeMetric
 from infra_libs.ts_mon.metrics import StringMetric
 
-from infra_libs.ts_mon.monitors import ApiMonitor
-from infra_libs.ts_mon.monitors import DiskMonitor
-from infra_libs.ts_mon.monitors import NullMonitor
+import infra_libs.ts_mon.gae