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      1 # Copyright 2014 The Chromium Authors. All rights reserved.
      2 # Use of this source code is governed by a BSD-style license that can be
      3 # found in the LICENSE file.
      4 
      5 import exceptions
      6 
      7 
      8 # pylint: disable=R0201
      9 class BaseController(object):
     10   def StartTracing(self, _):
     11     raise exceptions.NotImplementedError
     12 
     13   def StopTracing(self):
     14     raise exceptions.NotImplementedError
     15 
     16   def PullTrace(self):
     17     raise exceptions.NotImplementedError
     18