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/neteq_impl.cc

@@ -374,6 +374,17 @@ int NetEqImpl::DecodedRtpInfo(int* sequence_number, uint32_t* timestamp) {
   return 0;
 }
 
+int NetEqImpl::InsertSyncPacket(const WebRtcRTPHeader& /* rtp_header */,
+                                uint32_t /* receive_timestamp */) {
+  return kNotImplemented;
+}
+
+void NetEqImpl::SetBackgroundNoiseMode(NetEqBackgroundNoiseMode /* mode */) {}
+
+NetEqBackgroundNoiseMode NetEqImpl::BackgroundNoiseMode() const {
+  return kBgnOn;
+}
+
 // Methods below this line are private.