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

device/hid/fake_input_service_linux.cc

+// 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.
+
+#include "device/hid/fake_input_service_linux.h"
+
+#include <string>
+#include <vector>
+
+namespace device {
+
+FakeInputServiceLinux::FakeInputServiceLinux() {
+}
+
+FakeInputServiceLinux::~FakeInputServiceLinux() {
+}
+
+void FakeInputServiceLinux::AddDeviceForTesting(const InputDeviceInfo& info) {
+  AddDevice(info);
+}
+
+void FakeInputServiceLinux::RemoveDeviceForTesting(const std::string& id) {
+  RemoveDevice(id);
+}
+
+void FakeInputServiceLinux::ClearDeviceList() {
+  devices_.clear();
+}
+
+}  // namespace device