Keep on sending stun binding requests on zero-cost networks.

webrtc/p2p/base/stunrequest.cc

Index: webrtc/p2p/base/stunrequest.cc
diff --git a/webrtc/p2p/base/stunrequest.cc b/webrtc/p2p/base/stunrequest.cc
index ce0364e8db55e48bb6b7afd22d98d1ff2c1b3b04..f8a73e643283a5f3c7885222781b10fb14fb8ea9 100644
--- a/webrtc/p2p/base/stunrequest.cc
+++ b/webrtc/p2p/base/stunrequest.cc
@@ -63,6 +63,16 @@ void StunRequestManager::Flush(int msg_type) {
   }
 }
 
+bool StunRequestManager::Exist(int msg_type) {

[pthatcher1, 2016/03/02 20:25:59]

I think HasAny might be a better name.

[honghaiz3, 2016/03/02 23:22:51]

Done. using HasRequest

+  for (const auto kv : requests_) {
+    StunRequest* request = kv.second;
+    if (msg_type == kAllRequests || msg_type == request->type()) {
+      return true;
+    }
+  }
+  return false;
+}
+
 void StunRequestManager::Remove(StunRequest* request) {
   ASSERT(request->manager() == this);
   RequestMap::iterator iter = requests_.find(request->id());