[EasyUnlock] Update ProximityMonitor to only check for RSSI proximity.

components/proximity_auth/remote_device_life_cycle.h

 // 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.
 
 #ifndef COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_H
 #define COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_H
 
 #include "base/macros.h"
+#include "components/cryptauth/connection.h"
 #include "components/cryptauth/remote_device.h"
 
 namespace proximity_auth {
 
 class Messenger;
 
 // Controls the life cycle of connecting and authenticating to a remote device.
 // After the life cycle is started, it can be in the following states:
 //   FINDING_CONNECTION:
 //       Continuiously attempts to create a connection to the remote device.
@@ skipping 31 matching lines @@
   };
 
   virtual ~RemoteDeviceLifeCycle() {}
 
   // Starts the life cycle.
   virtual void Start() = 0;
 
   // Returns the RemoteDevice instance that this life cycle manages.
   virtual cryptauth::RemoteDevice GetRemoteDevice() const = 0;
 
+  // Returns the current Connection, or null if the device is not yet connected.
+  virtual cryptauth::Connection* GetConnection() const = 0;
+
   // Returns the current state of in the life cycle.
   virtual State GetState() const = 0;
 
   // Returns the client for sending and receiving messages. This function will
   // only return an instance if the state is SECURE_CHANNEL_ESTABLISHED;
   // otherwise, it will return nullptr.
   virtual Messenger* GetMessenger() = 0;
 
   // Adds an observer.
   virtual void AddObserver(Observer* observer) = 0;
 
   // Removes an observer.
   virtual void RemoveObserver(Observer* observer) = 0;
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_H