Implement BluetoothLowEnergyWrapperFake for Bluetooth test fixture

device/bluetooth/test/bluetooth_test.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 DEVICE_BLUETOOTH_TEST_BLUETOOTH_TEST_H_
 #define DEVICE_BLUETOOTH_TEST_BLUETOOTH_TEST_H_
 
 #include <stdint.h>
 
 #include "base/memory/ref_counted.h"
@@ skipping 40 matching lines @@
   BluetoothTestBase();
   ~BluetoothTestBase() override;
 
   // Checks that no unexpected calls have been made to callbacks.
   // Overrides of this method should always call the parent's class method.
   void TearDown() override;
 
   // Calls adapter_->StartDiscoverySessionWithFilter with Low Energy transport,
   // and this fixture's callbacks expecting success.
   // Then RunLoop().RunUntilIdle().
-  void StartLowEnergyDiscoverySession();
+  virtual void StartLowEnergyDiscoverySession();
 
   // Calls adapter_->StartDiscoverySessionWithFilter with Low Energy transport,
   // and this fixture's callbacks expecting error.
   // Then RunLoop().RunUntilIdle().
   void StartLowEnergyDiscoverySessionExpectedToFail();
 
   // Check if Low Energy is available. On Mac, we require OS X >= 10.10.
   virtual bool PlatformSupportsLowEnergy() = 0;
 
   // Initializes the BluetoothAdapter |adapter_| with the system adapter.
@@ skipping 180 matching lines @@
   int actual_error_callback_calls_ = 0;
   bool unexpected_success_callback_ = false;
   bool unexpected_error_callback_ = false;
 
   base::WeakPtrFactory<BluetoothTestBase> weak_factory_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_TEST_BLUETOOTH_TEST_H_