[CrOS Tether] Create DisconnectTetheringOperation, which sends a DisconnectTetheringRequest to a re…

chromeos/components/tether/message_transfer_operation.h

 // Copyright 2017 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.
 
 #ifndef CHROMEOS_COMPONENTS_TETHER_MESSAGE_TRANSFER_OPERATION_H_
 #define CHROMEOS_COMPONENTS_TETHER_MESSAGE_TRANSFER_OPERATION_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 58 matching lines @@
 
   // Returns the type of message that this operation intends to send.
   virtual MessageType GetMessageTypeForConnection() = 0;
 
   std::vector<cryptauth::RemoteDevice>& remote_devices() {
     return remote_devices_;
   }
 
  private:
   friend class ConnectTetheringOperationTest;
+  friend class DisconnectTetheringOperationTest;
   friend class HostScannerOperationTest;
   friend class MessageTransferOperationTest;
 
   static uint32_t kMaxConnectionAttemptsPerDevice;
 
   std::vector<cryptauth::RemoteDevice> remote_devices_;
   BleConnectionManager* connection_manager_;
 
   bool initialized_;
   std::map<cryptauth::RemoteDevice, uint32_t>
       remote_device_to_num_attempts_map_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageTransferOperation);
 };
 
 }  // namespace tether
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_COMPONENTS_TETHER_MESSAGE_TRANSFER_OPERATION_H_