Add service unittest for WakeLockServiceImpl.

device/wake_lock/wake_lock_service_impl.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_WAKE_LOCK_WAKE_LOCK_SERVICE_IMPL_H_
 #define DEVICE_WAKE_LOCK_WAKE_LOCK_SERVICE_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 20 matching lines @@
       scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
   ~WakeLockServiceImpl() override;
 
   // WakeLockSevice implementation.
   void RequestWakeLock() override;
   void CancelWakeLock() override;
   void AddClient(mojom::WakeLockServiceRequest request) override;
   void HasWakeLockForTests(
       const HasWakeLockForTestsCallback& callback) override;
 
+ protected:
+  int num_lock_requests_;
+
  private:
-  void UpdateWakeLock();
-  void CreateWakeLock();
-  void RemoveWakeLock();
+  virtual void UpdateWakeLock();
+  virtual void CreateWakeLock();
+  virtual void RemoveWakeLock();
+
   void OnConnectionError();
 
   mojom::WakeLockType type_;
   mojom::WakeLockReason reason_;
   std::unique_ptr<std::string> description_;
-  int num_lock_requests_;
 
 #if defined(OS_ANDROID)
   int context_id_;
   WakeLockContextCallback native_view_getter_;
 #endif
 
   scoped_refptr<base::SequencedTaskRunner> main_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
 
   // The actual power save blocker for screen.
   std::unique_ptr<PowerSaveBlocker> wake_lock_;
 
   // Multiple clients that associate to the same WebContents share the same one
   // WakeLockServiceImpl instance. Two consecutive |RequestWakeLock| requests
   // from the same client should be coalesced as one request. Everytime a new
   // client is being added into the BindingSet, we create an unique_ptr<bool>
   // as its context, which records this client's request status.
   mojo::BindingSet<mojom::WakeLockService, std::unique_ptr<bool>> binding_set_;
 
   DISALLOW_COPY_AND_ASSIGN(WakeLockServiceImpl);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_WAKE_LOCK_WAKE_LOCK_SERVICE_IMPL_H_