Allow applications to limit the ICE check rate through RTCConfiguration

webrtc/p2p/base/jseptransport.h

Index: webrtc/p2p/base/jseptransport.h
diff --git a/webrtc/p2p/base/jseptransport.h b/webrtc/p2p/base/jseptransport.h
index c7998ba0fb46aca846bced52544916a038a17cb5..5882987dd48c2046320918aa8e9597312be524df 100644
--- a/webrtc/p2p/base/jseptransport.h
+++ b/webrtc/p2p/base/jseptransport.h
@@ -187,6 +187,11 @@ struct IceConfig {
   // Default nomination mode if the remote does not support renomination.
   NominationMode default_nomination_mode = NominationMode::SEMI_AGGRESSIVE;
 
+  // ICE checks (STUN pings) will not be sent at higher rate (lower interval)
+  // than this, no matter what other settings there are.
+  // Measure in milliseconds.

[Taylor Brandstetter, 2017/02/02 07:03:55]

nit: This can match the other comment

+  rtc::Optional<int> min_ping_interval;

[Taylor Brandstetter, 2017/02/02 07:03:55]

nit: Would prefer more consistent naming between "ice_check_min_interval" and
"min_ping_interval"

[skvlad, 2017/02/02 08:51:25]

Renamed to ice_check_min_interval. "ICE" is really redundant here since it's
IceSettings, but "check_min_interval" doesn't seem to mean anything.

+
   IceConfig() {}
   IceConfig(int receiving_timeout_ms,
             int backup_connection_ping_interval,