Add Cast PLI support on sender side.

chrome/renderer/media/cast_ipc_dispatcher.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.
 
 #ifndef CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_
 #define CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
@@ skipping 37 matching lines @@
                        const media::cast::RtcpSenderInfo& sender_info,
                        base::TimeTicks time_sent,
                        uint32_t rtp_timestamp);
   void OnRawEvents(int32_t channel_id,
                    const std::vector<media::cast::PacketEvent>& packet_events,
                    const std::vector<media::cast::FrameEvent>& frame_events);
   void OnRtt(int32_t channel_id, uint32_t ssrc, base::TimeDelta rtt);
   void OnRtcpCastMessage(int32_t channel_id,
                          uint32_t ssrc,
                          const media::cast::RtcpCastMessage& cast_message);
+  void OnReceivedPli(int32_t channel_id, int32_t ssrc);
   void OnReceivedPacket(int32_t channel_id, const media::cast::Packet& packet);
 
   static CastIPCDispatcher* global_instance_;
 
   // For IPC Send(); must only be accesed on |io_message_loop_|.
   IPC::Sender* sender_;
 
   // Task runner on which IPC calls are driven.
   const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   // A map of stream ids to delegates; must only be accessed on
   // |io_message_loop_|.
   IDMap<CastTransportSenderIPC> id_map_;
   DISALLOW_COPY_AND_ASSIGN(CastIPCDispatcher);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_CAST_IPC_DISPATCHER_H_