Implement Linux media notifier.

content/content_browser.gypi

 # Copyright (c) 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.
 
 {
   'dependencies': [
     'browser/debugger/devtools_resources.gyp:devtools_resources',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../net/net.gyp:http_server',
@@ skipping 360 matching lines @@
     'browser/intents/intent_injector.h',
     'browser/intents/web_intents_dispatcher_impl.cc',
     'browser/intents/web_intents_dispatcher_impl.h',
     'browser/load_from_memory_cache_details.cc',
     'browser/load_from_memory_cache_details.h',
     'browser/load_notification_details.h',
     'browser/mac/media_device_notifications.h',
     'browser/mac/media_device_notifications.mm',
     'browser/mach_broker_mac.cc',
     'browser/mach_broker_mac.h',
+    'browser/media_device_notifications_linux.cc',
+    'browser/media_device_notifications_linux.h',
     'browser/mime_registry_message_filter.cc',
     'browser/mime_registry_message_filter.h',
     'browser/net/browser_online_state_observer.cc',
     'browser/net/browser_online_state_observer.h',
     # TODO:  These should be moved to test_support (see below), but
     # are currently used by production code in automation_provider.cc.
     'browser/net/url_request_failed_dns_job.cc',
     'browser/net/url_request_failed_dns_job.h',
     'browser/net/url_request_mock_http_job.cc',
     'browser/net/url_request_mock_http_job.h',
@@ skipping 476 matching lines @@
       ],
     }],
     ['input_speech==0', {
       'sources/': [
         ['exclude', '^browser/speech/'],
       ],
     }],
   ],
 }