[CrOS Tether]: Create BleConnectionManager, which manages secure connections between the current de…

chromeos/components/tether/ble_scanner.h

Index: chromeos/components/tether/ble_scanner.h
diff --git a/chromeos/components/tether/ble_scanner.h b/chromeos/components/tether/ble_scanner.h
index a601417ba4db7e6f0644e1defa872f37f3d6cf6e..a2771af8f552a9e999e306c82d31d2c22b879764 100644
--- a/chromeos/components/tether/ble_scanner.h
+++ b/chromeos/components/tether/ble_scanner.h
@@ -36,9 +36,9 @@ class BleScanner : public device::BluetoothAdapter::Observer {
   BleScanner(const LocalDeviceDataProvider* local_device_data_provider);
   ~BleScanner() override;
 
-  bool RegisterScanFilterForDevice(
+  virtual bool RegisterScanFilterForDevice(
       const cryptauth::RemoteDevice& remote_device);
-  bool UnregisterScanFilterForDevice(
+  virtual bool UnregisterScanFilterForDevice(
       const cryptauth::RemoteDevice& remote_device);
 
   bool IsDeviceRegistered(const std::string& device_id);
@@ -54,6 +54,9 @@ class BleScanner : public device::BluetoothAdapter::Observer {
   void DeviceChanged(device::BluetoothAdapter* adapter,
                      device::BluetoothDevice* bluetooth_device) override;
 
+ protected:
+  base::ObserverList<Observer> observer_list_;
+
  private:
   friend class BleScannerTest;
 
@@ -111,8 +114,6 @@ class BleScanner : public device::BluetoothAdapter::Observer {
 
   std::vector<cryptauth::RemoteDevice> registered_remote_devices_;
 
-  base::ObserverList<Observer> observer_list_;
-
   base::WeakPtrFactory<BleScanner> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BleScanner);