[BattOr] Add ability to platform object to detect BattOrs.

telemetry/telemetry/core/platform.py

 # Copyright 2012 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.
 import logging as real_logging
 import os
 import sys
 
 from telemetry.core import discover
 from telemetry.core import local_server
 from telemetry.core import memory_cache_http_server
@@ skipping 380 matching lines @@
     self.StartLocalServer(server)
     return True
 
   def StopAllLocalServers(self):
     self._local_server_controller.Close()
 
   @property
   def local_servers(self):
     """Returns the currently running local servers."""
     return self._local_server_controller.local_servers
+
+  def HasBattOrConnected(self):
+    return  self._platform_backend.HasBattOrConnected()