Wire up RTP keep-alive in ortc api.

webrtc/media/engine/fakewebrtccall.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 629 matching lines @@
   }
 }
 
 void FakeCall::OnSentPacket(const rtc::SentPacket& sent_packet) {
   last_sent_packet_ = sent_packet;
   if (sent_packet.packet_id >= 0) {
     last_sent_nonnegative_packet_id_ = sent_packet.packet_id;
   }
 }
 
+bool FakeCall::SetRtpKeepAliveConfig(const webrtc::RtpKeepAliveConfig& config) {
+  if ((config != config_.keepalive_config) && num_created_send_streams_ > 0)
+    return false;
+
+  config_.keepalive_config = config;
+  return true;
+}
+
 }  // namespace cricket