Created fakes for HID-detection screen testing. Initial browsertest added.

chrome/browser/chromeos/device/input_service_proxy.h

Index: chrome/browser/chromeos/device/input_service_proxy.h
diff --git a/chrome/browser/chromeos/device/input_service_proxy.h b/chrome/browser/chromeos/device/input_service_proxy.h
index e41196f62ca05046a4dda634f82ab0fc329dce87..4514144935e74f7817712eeb6f2d4ca7017dbba8 100644
--- a/chrome/browser/chromeos/device/input_service_proxy.h
+++ b/chrome/browser/chromeos/device/input_service_proxy.h
@@ -35,7 +35,7 @@ class InputServiceProxy {
       GetDeviceInfoCallback;
 
   InputServiceProxy();
-  ~InputServiceProxy();
+  virtual ~InputServiceProxy();
 
   // Used for early init for cashing info about available HID.
   static void WarmUp();
@@ -43,17 +43,20 @@ class InputServiceProxy {
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
-  void GetDevices(const GetDevicesCallback& callback);
-  void GetDeviceInfo(const std::string& id,
-                     const GetDeviceInfoCallback& callback);
+  virtual void GetDevices(const GetDevicesCallback& callback);
+  virtual void GetDeviceInfo(const std::string& id,
+                             const GetDeviceInfoCallback& callback);
+
+ protected:
+  ObserverList<Observer> observers_;
 
  private:
   class ServiceObserver;
 
-  void OnDeviceAdded(const device::InputServiceLinux::InputDeviceInfo& info);
-  void OnDeviceRemoved(const std::string& id);
+  virtual void OnDeviceAdded(
+      const device::InputServiceLinux::InputDeviceInfo& info);
+  virtual void OnDeviceRemoved(const std::string& id);
 
-  ObserverList<Observer> observers_;
   scoped_ptr<ServiceObserver> service_observer_;
 
   base::ThreadChecker thread_checker_;