Set keyboard mic effect if available.

content/browser/renderer_host/media/media_stream_manager.h

 // 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.
 
 // MediaStreamManager is used to open/enumerate media capture devices (video
 // supported now). Call flow:
 // 1. GenerateStream is called when a render process wants to use a capture
 //    device.
 // 2. MediaStreamManager will ask MediaStreamUIController for permission to
 //    use devices and for which device to use.
@@ skipping 345 matching lines @@
   // the webrtcLoggingPrivate API if requested.
   void AddLogMessageOnUIThread(const std::set<int>& render_process_ids,
                                const std::string& message);
 
   // Handles the callback from MediaStreamUIProxy to receive the UI window id,
   // used for excluding the notification window in desktop capturing.
   void OnMediaStreamUIWindowId(MediaStreamType video_type,
                                StreamDeviceInfoArray devices,
                                gfx::NativeViewId window_id);
 
+#if defined(OS_CHROMEOS)
+  // Checks if the system has a keyboard mic, and if so, inform the audio
+  // manager via SetKeyboardMicOnDeviceThread().
+  void CheckKeyboardMicOnUIThread();
+
+  // Tells the audio mananger that the system supports a keyboard mic.
+  void SetKeyboardMicOnDeviceThread();
+#endif
+
   // Task runner shared by VideoCaptureManager and AudioInputDeviceManager and
   // used for enumerating audio output devices.
   // Note: Enumeration tasks may take seconds to complete so must never be run
   // on any of the BrowserThreads (UI, IO, etc).  See http://crbug.com/256945.
   scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
 
   media::AudioManager* const audio_manager_;  // not owned
   scoped_refptr<AudioInputDeviceManager> audio_input_device_manager_;
   scoped_refptr<VideoCaptureManager> video_capture_manager_;
 
   // Indicator of device monitoring state.
   bool monitoring_started_;
 
+#if defined(OS_CHROMEOS)
+  // Flag that's set when we have checked if the system has a keyboard mic. We
+  // only need to check it once, and not when constructing since that will
+  // affect startup time.
+  // Must be accessed on the IO thread;
+  bool has_checked_keyboard_mic_;
+#endif
+
   // Stores most recently enumerated device lists. The cache is cleared when
   // monitoring is stopped or there is no request for that type of device.
   EnumerationCache audio_enumeration_cache_;
   EnumerationCache video_enumeration_cache_;
 
   // Keeps track of live enumeration commands sent to VideoCaptureManager or
   // AudioInputDeviceManager, in order to only enumerate when necessary.
   int active_enumeration_ref_count_[NUM_MEDIA_TYPES];
 
   // All non-closed request. Must be accessed on IO thread.
   DeviceRequests requests_;
 
   // Hold a pointer to the IO loop to check we delete the device thread and
   // managers on the right thread.
   base::MessageLoop* io_loop_;
 
   bool use_fake_ui_;
   scoped_ptr<FakeMediaStreamUIProxy> fake_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_