Wire up RTP keep-alive in ortc api.

webrtc/call/call.h

Index: webrtc/call/call.h
diff --git a/webrtc/call/call.h b/webrtc/call/call.h
index f99ba851ab420daeb5c12f03e1577f1701c4cbb3..d4149f1b52b2b2fc127640925e50ba1487cb80af 100644
--- a/webrtc/call/call.h
+++ b/webrtc/call/call.h
@@ -205,6 +205,10 @@ class Call {
 
   virtual void OnSentPacket(const rtc::SentPacket& sent_packet) = 0;
 
+  // Try to update the RTP keep-alive part of the call config. This is allowed
+  // only before creating any send streams. Returns true on success.
+  virtual bool SetRtpKeepAliveConfig(const RtpKeepAliveConfig& config) = 0;
+
   virtual ~Call() {}
 };