Add AshDesktopMediaList and enable Desktop Capture API on Chrome OS.

chrome/chrome_browser.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': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1010 matching lines @@
         'browser/managed_mode/managed_user_sync_service.cc',
         'browser/managed_mode/managed_user_sync_service.h',
         'browser/managed_mode/managed_user_sync_service_factory.cc',
         'browser/managed_mode/managed_user_sync_service_factory.h',
         'browser/managed_mode/managed_user_sync_service_observer.h',
         'browser/managed_mode/managed_user_theme.cc',
         'browser/managed_mode/managed_user_theme.h',
         'browser/managed_mode/managed_users.h',
         'browser/managed_mode/supervised_user_pref_store.cc',
         'browser/managed_mode/supervised_user_pref_store.h',
+        'browser/media/ash_desktop_media_list.cc',
+        'browser/media/ash_desktop_media_list.h',
         'browser/media/audio_stream_indicator.cc',
         'browser/media/audio_stream_indicator.h',
         'browser/media/chrome_midi_permission_context.cc',
         'browser/media/chrome_midi_permission_context.h',
         'browser/media/chrome_midi_permission_context_factory.cc',
         'browser/media/chrome_midi_permission_context_factory.h',
         'browser/media/desktop_media_list.h',
         'browser/media/desktop_media_picker.h',
         'browser/media/desktop_streams_registry.cc',
         'browser/media/desktop_streams_registry.h',
@@ skipping 2701 matching lines @@
             'package_name': 'org/chromium/chrome/browser/ui/toolbar',
             'template_deps': ['browser/ui/toolbar/toolbar_model_security_level_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }