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

webrtc/p2p/base/p2ptransportchannel.h

Index: webrtc/p2p/base/p2ptransportchannel.h
diff --git a/webrtc/p2p/base/p2ptransportchannel.h b/webrtc/p2p/base/p2ptransportchannel.h
index 11399d0681de0f1309fc427caafaacedfc7ed993..12045af700f853a6ee011574fa5f15eafd4a122b 100644
--- a/webrtc/p2p/base/p2ptransportchannel.h
+++ b/webrtc/p2p/base/p2ptransportchannel.h
@@ -213,6 +213,8 @@ class P2PTransportChannel : public TransportChannelImpl,
   void OnSort();
   void OnPing();
 
+  void OnCheckReceiving();
+
   P2PTransport* transport_;
   PortAllocator *allocator_;
   rtc::Thread *worker_thread_;
@@ -241,6 +243,9 @@ class P2PTransportChannel : public TransportChannelImpl,
   uint64 tiebreaker_;
   uint32 remote_candidate_generation_;
 
+  int check_receiving_delay_;
+  int receiving_timeout_;
+
   DISALLOW_COPY_AND_ASSIGN(P2PTransportChannel);
 };