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

device/hid/fake_input_service_linux.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_HID_FAKE_INPUT_SERVICE_LINUX_H_
+#define DEVICE_HID_FAKE_INPUT_SERVICE_LINUX_H_
+
+#include <string>
+
+#include "device/hid/input_service_linux.h"
+
+namespace device {
+
+class FakeInputServiceLinux : public InputServiceLinux {
+
+ public:
+  FakeInputServiceLinux();
+  ~FakeInputServiceLinux() override;
+
+  void AddDeviceForTesting(const InputDeviceInfo& info);
+  void RemoveDeviceForTesting(const std::string& id);
+  void ClearDeviceList();
+
+  DISALLOW_COPY_AND_ASSIGN(FakeInputServiceLinux);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_HID_FAKE_INPUT_SERVICE_LINUX_H_