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

device/hid/hid.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'device_hid',
       'type': 'static_library',
       'include_dirs': [
         '../..',
       ],
       'dependencies': [
         '../../components/components.gyp:device_event_log_component',
         '../../net/net.gyp:net',
         '../core/core.gyp:device_core',
       ],
       'sources': [
         'device_monitor_linux.cc',
         'device_monitor_linux.h',
+        'fake_input_service_linux.cc',
+        'fake_input_service_linux.h',
         'hid_collection_info.cc',
         'hid_collection_info.h',
         'hid_connection.cc',
         'hid_connection.h',
         'hid_connection_linux.cc',
         'hid_connection_linux.h',
         'hid_connection_mac.cc',
         'hid_connection_mac.h',
         'hid_connection_win.cc',
         'hid_connection_win.h',
@@ skipping 25 matching lines @@
           'dependencies': [
             '../udev_linux/udev.gyp:udev_linux',
           ],
         }, {  # use_udev==0
           # The Linux implementation is based on Udev.
           'sources!': [
             'device_monitor_linux.cc',
             'device_monitor_linux.h',
             'hid_service_linux.cc',
             'hid_service_linux.h',
+            'fake_input_service_linux.cc',
+            'fake_input_service_linux.h',
             'input_service_linux.cc',
             'input_service_linux.h',
           ],
         }],
       ],
     },
   ],
 }