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

device/hid/input_service_linux.h

Index: device/hid/input_service_linux.h
diff --git a/device/hid/input_service_linux.h b/device/hid/input_service_linux.h
index 55bf70c1c682a1231795bdce2173c7c28d7bc147..7eda3bb8126b0ba962b32b24f99e44985676cd43 100644
--- a/device/hid/input_service_linux.h
+++ b/device/hid/input_service_linux.h
@@ -45,6 +45,9 @@ class InputServiceLinux : public base::MessageLoop::DestructionObserver {
     bool is_touchscreen : 1;
   };
 
+
+  using DeviceMap = base::hash_map<std::string, InputDeviceInfo>;
+
   class Observer {
    public:
     virtual ~Observer() {}
@@ -53,6 +56,7 @@ class InputServiceLinux : public base::MessageLoop::DestructionObserver {
   };
 
   InputServiceLinux();
+  ~InputServiceLinux() override;
 
   static InputServiceLinux* GetInstance();
   static bool HasInstance();
@@ -73,21 +77,18 @@ class InputServiceLinux : public base::MessageLoop::DestructionObserver {
   void WillDestroyCurrentMessageLoop() override;
 
  protected:
-  ~InputServiceLinux() override;
 
   void AddDevice(const InputDeviceInfo& info);
   void RemoveDevice(const std::string& id);
 
   bool CalledOnValidThread() const;
 
- private:
-  friend struct base::DefaultDeleter<InputServiceLinux>;
-
-  typedef base::hash_map<std::string, InputDeviceInfo> DeviceMap;
-
   DeviceMap devices_;
   ObserverList<Observer> observers_;
 
+ private:
+  friend struct base::DefaultDeleter<InputServiceLinux>;
+
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(InputServiceLinux);