Add DeviceEventRouter class.

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 666 matching lines @@
         'browser/chromeos/drive/sync_client_unittest.cc',
         'browser/chromeos/drive/test_util.cc',
         'browser/chromeos/drive/test_util.h',
         'browser/chromeos/drive/write_on_cache_file_unittest.cc',
         'browser/chromeos/events/event_rewriter_unittest.cc',
         'browser/chromeos/events/keyboard_driven_event_rewriter_unittest.cc',
         'browser/chromeos/extensions/default_app_order_unittest.cc',
         'browser/chromeos/extensions/device_local_account_external_policy_loader_unittest.cc',
         'browser/chromeos/extensions/device_local_account_management_policy_provider_unittest.cc',
         'browser/chromeos/extensions/external_cache_unittest.cc',
+        'browser/chromeos/extensions/file_manager/device_event_router_unittest.cc',
         'browser/chromeos/extensions/wallpaper_private_api_unittest.cc',
         'browser/chromeos/external_metrics_unittest.cc',
         'browser/chromeos/file_manager/fake_disk_mount_manager.cc',
         'browser/chromeos/file_manager/fake_disk_mount_manager.h',
         'browser/chromeos/file_manager/file_tasks_unittest.cc',
         'browser/chromeos/file_manager/file_watcher_unittest.cc',
         'browser/chromeos/file_manager/mounted_disk_monitor_unittest.cc',
         'browser/chromeos/file_manager/path_util_unittest.cc',
         'browser/chromeos/file_manager/url_util_unittest.cc',
         'browser/chromeos/file_manager/volume_manager_unittest.cc',
@@ skipping 2188 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }