Add flakiness check if there is no received packets in a certain period.

webrtc/p2p/base/transportchannel.cc

Index: webrtc/p2p/base/transportchannel.cc
diff --git a/webrtc/p2p/base/transportchannel.cc b/webrtc/p2p/base/transportchannel.cc
index a4e8cb8df51f41a83755c8601a3f60fc294bf66d..5fb0eb472cd468c4129b114e035f667107a7b184 100644
--- a/webrtc/p2p/base/transportchannel.cc
+++ b/webrtc/p2p/base/transportchannel.cc
@@ -31,6 +31,14 @@ void TransportChannel::set_readable(bool readable) {
   }
 }
 
+void TransportChannel::set_receiving(bool receiving) {
+  if (receiving_ == receiving) {
+    return;
+  }
+  receiving_ = receiving;
+  SignalReceivingState(this);
+}
+
 void TransportChannel::set_writable(bool writable) {
   if (writable_ != writable) {
     LOG_J(LS_VERBOSE, this) << "set_writable from:" << writable_ << " to "