Add Cast PLI support on sender side.

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 77 matching lines @@
       scoped_ptr<PacketSender> transport,
       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.
   virtual void InitializeAudio(const CastTransportRtpConfig& config,
                                const RtcpCastMessageCallback& cast_message_cb,
-                               const RtcpRttCallback& rtt_cb) = 0;
+                               const RtcpRttCallback& rtt_cb,
+                               const RtcpPliCallback& pli_cb) = 0;
   virtual void InitializeVideo(const CastTransportRtpConfig& config,
                                const RtcpCastMessageCallback& cast_message_cb,
-                               const RtcpRttCallback& rtt_cb) = 0;
+                               const RtcpRttCallback& rtt_cb,
+                               const RtcpPliCallback& pli_cb) = 0;
 
   // Encrypt, packetize and transmit |frame|. |ssrc| must refer to a
   // a channel already established with InitializeAudio / InitializeVideo.
   virtual void InsertFrame(uint32_t ssrc, const EncodedFrame& frame) = 0;
 
   // Sends a RTCP sender report to the receiver.
   // |ssrc| is the SSRC for this report.
   // |current_time| is the current time reported by a tick clock.
   // |current_time_as_rtp_timestamp| is the corresponding RTP timestamp.
   virtual void SendSenderReport(uint32_t ssrc,
@@ skipping 31 matching lines @@
       const RtpReceiverStatistics* rtp_receiver_statistics) = 0;
 
   // Set options for the PacedSender and Wifi.
   virtual void SetOptions(const base::DictionaryValue& options) = 0;
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_NET_CAST_TRANSPORT_SENDER_H_