Ping backup connection at a slower rate

talk/app/webrtc/java/jni/peerconnection_jni.cc

Index: talk/app/webrtc/java/jni/peerconnection_jni.cc
diff --git a/talk/app/webrtc/java/jni/peerconnection_jni.cc b/talk/app/webrtc/java/jni/peerconnection_jni.cc
index 194f9ff98c1b2887b4ae16c921ab35a7088954ec..63dd21b2cc30ab51f103641b70d22bf0911688b8 100644
--- a/talk/app/webrtc/java/jni/peerconnection_jni.cc
+++ b/talk/app/webrtc/java/jni/peerconnection_jni.cc
@@ -1552,6 +1552,9 @@ static void JavaRTCConfigurationToJsepRTCConfiguration(
   jfieldID j_ice_connection_receiving_timeout_id =
       GetFieldID(jni, j_rtc_config_class, "iceConnectionReceivingTimeout", "I");
 
+  jfieldID j_ice_backup_connection_ping_interval_id = GetFieldID(
+      jni, j_rtc_config_class, "iceBackupConnectionPingInterval", "I");

[pthatcher1, 2015/12/01 19:40:25]

We should start using "candidate pair" instead of "connection", especially in
public APIs. So, iceBackupCandidatePairPingInterval

[honghaiz3, 2015/12/01 23:43:08]

Done. Also changed the one ice_backup_connection to ice_backup_candidate_pair to
be consistent. Kept the name backup_connection* in IceConfig. 

+
   jfieldID j_continual_gathering_policy_id =
       GetFieldID(jni, j_rtc_config_class, "continualGatheringPolicy",
                  "Lorg/webrtc/PeerConnection$ContinualGatheringPolicy;");
@@ -1573,6 +1576,8 @@ static void JavaRTCConfigurationToJsepRTCConfiguration(
       jni, j_rtc_config, j_audio_jitter_buffer_fast_accelerate_id);
   rtc_config->ice_connection_receiving_timeout =
       GetIntField(jni, j_rtc_config, j_ice_connection_receiving_timeout_id);
+  rtc_config->ice_backup_connection_ping_interval =
+      GetIntField(jni, j_rtc_config, j_ice_backup_connection_ping_interval_id);
   rtc_config->continual_gathering_policy =
       JavaContinualGatheringPolicyToNativeType(
           jni, j_continual_gathering_policy);