support video device enumeration from renderer process.

content/renderer/media/media_stream_dispatcher.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.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_DISPATCHER_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_DISPATCHER_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 23 matching lines @@
   // Note: The event_handler must be valid for as long as the stream exists.
   virtual void GenerateStream(
       int request_id,
       MediaStreamDispatcherEventHandler* event_handler,
       media_stream::StreamOptions components,
       const std::string& security_origin);
 
   // Stop a started stream. Label is the label provided in OnStreamGenerated.
   virtual void StopStream(const std::string& label);
 
+  // Request to enumerate devices.
+  void EnumerateDevices(int request_id,
+                        MediaStreamDispatcherEventHandler* event_handler,
+                        media_stream::MediaStreamType type,
+                        const std::string& security_origin);
+
+  // Request to open a device.
+  void OpenDevice(int request_id,
+                  MediaStreamDispatcherEventHandler* event_handler,
+                  const std::string& device_id,
+                  media_stream::MediaStreamType type,
+                  const std::string& security_origin);
+
+  // Close a started device. |label| is provided in OnDeviceOpened.
+  void CloseDevice(const std::string& label);
+
   // Check if the label is a valid stream.
   virtual bool IsStream(const std::string& label);
   // Get the video session_id given a label. The label identifies a stream.
   // index is the index in the video_device_array of the stream.
   virtual int video_session_id(const std::string& label, int index);
   // Returns an audio session_id given a label and an index.
   virtual int audio_session_id(const std::string& label, int index);
 
  private:
-  FRIEND_TEST_ALL_PREFIXES(MediaStreamDispatcherTest, Basic);
+  FRIEND_TEST_ALL_PREFIXES(MediaStreamDispatcherTest, BasicStream);
+  FRIEND_TEST_ALL_PREFIXES(MediaStreamDispatcherTest, BasicVideoDevice);
   FRIEND_TEST_ALL_PREFIXES(MediaStreamDispatcherTest, TestFailure);
 
   struct Request;
 
   // Private class for keeping track of opened devices and who have
   // opened it.
   struct Stream;
 
   // Messages from the browser.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   void OnStreamGenerated(
       int request_id,
       const std::string& label,
       const media_stream::StreamDeviceInfoArray& audio_array,
       const media_stream::StreamDeviceInfoArray& video_array);
   void OnStreamGenerationFailed(int request_id);
   void OnVideoDeviceFailed(const std::string& label, int index);
   void OnAudioDeviceFailed(const std::string& label, int index);
+  void OnDevicesEnumerated(
+      int request_id,
+      const media_stream::StreamDeviceInfoArray& device_array);
+  void OnDevicesEnumerationFailed(int request_id);
+  void OnDeviceOpened(
+      int request_id,
+      const std::string& label,
+      const media_stream::StreamDeviceInfo& device_info);
+  void OnDeviceOpenFailed(int request_id);
 
   int next_ipc_id_;
   typedef std::map<std::string, Stream> LabelStreamMap;
   LabelStreamMap label_stream_map_;
 
   // List of calls made to GenerateStream that has not yet completed.
   typedef std::list<Request> RequestList;
   RequestList requests_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDispatcher);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_DISPATCHER_H_