Add RTCP packet class for signaling encoder target bitrate.

webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h

Index: webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h b/webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h
index c433477707a57f6100c650ff01e3ec54d5dcacb3..592ac3fe43f2777823f20b65a6c473b28628c9c1 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h
@@ -18,6 +18,7 @@
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet.h"
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/dlrr.h"
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/rrtr.h"
+#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/target_bitrate.h"
 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/voip_metric.h"
 
 namespace webrtc {
@@ -40,6 +41,7 @@ class ExtendedReports : public RtcpPacket {
   void SetRrtr(const Rrtr& rrtr);
   void AddDlrrItem(const ReceiveTimeInfo& time_info);
   void SetVoipMetric(const VoipMetric& voip_metric);
+  void SetTargetBitrate(const TargetBitrate& target_bitrate);
 
   uint32_t sender_ssrc() const { return sender_ssrc_; }
   const rtc::Optional<Rrtr>& rrtr() const { return rrtr_block_; }
@@ -47,6 +49,9 @@ class ExtendedReports : public RtcpPacket {
   const rtc::Optional<VoipMetric>& voip_metric() const {
     return voip_metric_block_;
   }
+  const rtc::Optional<TargetBitrate>& target_bitrate() {
+    return target_bitrate_;
+  }
 
  protected:
   bool Create(uint8_t* packet,
@@ -59,7 +64,7 @@ class ExtendedReports : public RtcpPacket {
 
   size_t BlockLength() const override {
     return kHeaderLength + kXrBaseLength + RrtrLength() + DlrrLength() +
-           VoipMetricLength();
+           VoipMetricLength() + TargetBitrateLength();
   }
 
   size_t RrtrLength() const { return rrtr_block_ ? Rrtr::kLength : 0; }
@@ -67,15 +72,18 @@ class ExtendedReports : public RtcpPacket {
   size_t VoipMetricLength() const {
     return voip_metric_block_ ? VoipMetric::kLength : 0;
   }
+  size_t TargetBitrateLength() const;
 
   void ParseRrtrBlock(const uint8_t* block, uint16_t block_length);
   void ParseDlrrBlock(const uint8_t* block, uint16_t block_length);
   void ParseVoipMetricBlock(const uint8_t* block, uint16_t block_length);
+  void ParseTargetBitrateBlock(const uint8_t* block, uint16_t block_length);
 
   uint32_t sender_ssrc_;
   rtc::Optional<Rrtr> rrtr_block_;
   Dlrr dlrr_block_;  // Dlrr without items treated same as no dlrr block.
   rtc::Optional<VoipMetric> voip_metric_block_;
+  rtc::Optional<TargetBitrate> target_bitrate_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(ExtendedReports);
 };