Revert of Remove SendPacer from ViEEncoder

webrtc/call/call.cc

Index: webrtc/call/call.cc
diff --git a/webrtc/call/call.cc b/webrtc/call/call.cc
index ecee665f7b8bb2634d089bc3decc5fa04eac42f2..23173decc63fbf28fcad49fdaef2886ec90a2682 100644
--- a/webrtc/call/call.cc
+++ b/webrtc/call/call.cc
@@ -51,9 +51,8 @@
 
 namespace internal {
 
-class Call : public webrtc::Call,
-             public PacketReceiver,
-             public CongestionController::Observer {
+class Call : public webrtc::Call, public PacketReceiver,
+             public BitrateObserver {
  public:
   explicit Call(const Call::Config& config);
   virtual ~Call();
@@ -693,8 +692,10 @@
     pacer_bitrate_sum_kbits_ += pacer_bitrate_bps / 1000;
     ++num_bitrate_updates_;
   }
-  congestion_controller_->SetAllocatedSendBitrate(allocated_bitrate_bps,
-                                                  pad_up_to_bitrate_bps);
+  congestion_controller_->UpdatePacerBitrate(
+      target_bitrate_bps / 1000,
+      PacedSender::kDefaultPaceMultiplier * pacer_bitrate_bps / 1000,
+      pad_up_to_bitrate_bps / 1000);
 }
 
 void Call::ConfigureSync(const std::string& sync_group) {