Cast: Let the extension control if DSCP is on or off.

media/cast/net/cast_transport_sender.h

 // Copyright 2014 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.
 
 // This is the main interface for the cast transport sender.  It accepts encoded
 // frames (both audio and video), encrypts their encoded data, packetizes them
 // and feeds them into a transport (e.g., UDP).
 
 // Construction of the Cast Sender and the Cast Transport Sender should be done
 // in the following order:
@@ skipping 35 matching lines @@
                             const std::vector<FrameEvent>&)>
     BulkRawEventsCallback;
 
 // The application should only trigger this class from the transport thread.
 class CastTransportSender : public base::NonThreadSafe {
  public:
   static scoped_ptr<CastTransportSender> Create(
       net::NetLog* net_log,
       base::TickClock* clock,
       const net::IPEndPoint& remote_end_point,
+      const std::string& options,

[Alpha Left Google, 2014/09/09 00:30:46]

I suggest this be base::DictionaryValue which is a key value pair data
structure.

[hubbe, 2014/09/09 20:10:01]

Done.

       const CastTransportStatusCallback& status_callback,
       const BulkRawEventsCallback& raw_events_callback,
       base::TimeDelta raw_events_callback_interval,
       const scoped_refptr<base::SingleThreadTaskRunner>& transport_task_runner);
 
   virtual ~CastTransportSender() {}
 
   // Audio/Video initialization.
   // Encoded frames cannot be transmitted until the relevant initialize method
   // is called.
@@ skipping 28 matching lines @@
   virtual void ResendFrameForKickstart(uint32 ssrc, uint32 frame_id) = 0;
 
   // Returns a callback for receiving packets for testing purposes.
   virtual PacketReceiverCallback PacketReceiverForTesting();
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_NET_CAST_TRANSPORT_SENDER_H_