Adding APIs. These APIs are not implemented yet, they are to help developement of ACM.

Un-implemented APIs.

TBR=henrik.lundin@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/2191008

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4725 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/neteq4/interface/neteq.h

@@ -65,6 +65,12 @@ enum NetEqPlayoutMode {
   kPlayoutStreaming
 };
 
+enum NetEqBackgroundNoiseMode {
+  kBgnOn,
+  kBgnFade,
+  kBgnOff
+};
+
 // This is the interface class for NetEq.
 class NetEq {
  public:
@@ -237,6 +243,14 @@ class NetEq {
   // This method is to facilitate NACK.
   virtual int DecodedRtpInfo(int* sequence_number, uint32_t* timestamp) = 0;
 
+  // Not implemented.
+  virtual int InsertSyncPacket(const WebRtcRTPHeader& rtp_header,
+                               uint32_t receive_timestamp) = 0;
+
+  virtual void SetBackgroundNoiseMode(NetEqBackgroundNoiseMode mode) = 0;
+
+  virtual NetEqBackgroundNoiseMode BackgroundNoiseMode() const = 0;
+
  protected:
   NetEq() {}