Close all writers before JingleSession is destroyed.

remoting/protocol/video_writer.h

 // Copyright (c) 2010 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.
 
 // VideoWriter is a generic interface for a video stream writer. RtpVideoWriter
 // and ProtobufVideoWriter implement this interface for RTP and protobuf video
 // streams. VideoWriter is used by ConnectionToClient to write into the video
 // stream.
 
 #ifndef REMOTING_PROTOCOL_VIDEO_WRITER_H_
@@ skipping 11 matching lines @@
 // TODO(sergeyu): VideoWriter should implement VideoStub interface.
 class VideoWriter : public VideoStub {
  public:
   virtual ~VideoWriter();
 
   static VideoWriter* Create(const SessionConfig* config);
 
   // Initializes the writer.
   virtual void Init(Session* session) = 0;
 
+  // Stops writing. Must be called on the network thread before this
+  // object is destroyed.
+  virtual void Close() = 0;
+
  protected:
   VideoWriter() { }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoWriter);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_VIDEO_WRITER_H_