Adding MediaStreamManager.

content/common/media/media_stream_options.h

 // Copyright (c) 2011 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.
 
 #ifndef CONTENT_COMMON_MEDIA_MEDIA_STREAM_OPTIONS_H_
 #define CONTENT_COMMON_MEDIA_MEDIA_STREAM_OPTIONS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 18 matching lines @@
   bool audio;
 
   // Describes if a / which type of video capture device is requested.
   VideoOption video_option;
 };
 
 // Type of media stream.
 enum MediaStreamType {
   kNoService = 0,
   kAudioCapture,
-  kVideoCapture
+  kVideoCapture,
+  kNumMediaStreamTypes
 };
 
 // StreamDeviceInfo describes information about a device.
 struct StreamDeviceInfo {
   StreamDeviceInfo();
   StreamDeviceInfo(MediaStreamType service_param,
                    const std::string& name_param,
                    const std::string& device_param,
                    bool opened);
 
@@ skipping 10 matching lines @@
   bool in_use;
   // Id for this capture session. Unique for all sessions of the same type.
   int session_id;
 };
 
 typedef std::vector<StreamDeviceInfo> StreamDeviceInfoArray;
 
 }  // namespace media_stream
 
 #endif  // CONTENT_COMMON_MEDIA_MEDIA_STREAM_OPTIONS_H_