Add one API for implementing Initial delay.

R=minyue@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1939004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4475 4adac7df-926f-26a2-2b94-8c16560cd09d

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

@@ -216,6 +216,12 @@ class NetEq {
   // Flushes both the packet buffer and the sync buffer.
   virtual void FlushBuffers() = 0;
 
+  // Current usage of packet-buffer and it's limits.
+  virtual void PacketBufferStatistics(int* current_num_packets,
+                                      int* max_num_packets,
+                                      int* current_memory_size_bytes,
+                                      int* max_memory_size_bytes) const = 0;
+
  protected:
   NetEq() {}