QUIC - disable QUIC if packet loss rate is bad for a connection.

net/quic/quic_client_session.h

Index: net/quic/quic_client_session.h
diff --git a/net/quic/quic_client_session.h b/net/quic/quic_client_session.h
index b5590692528f00be6db99a072bf96e1550e92b01..5c47f6f807db6fb30e631aa674b6a6d8d2951b6c 100644
--- a/net/quic/quic_client_session.h
+++ b/net/quic/quic_client_session.h
@@ -174,6 +174,9 @@ class NET_EXPORT_PRIVATE QuicClientSession : public QuicClientSessionBase {
   // than the number of round-trips needed for the handshake.
   int GetNumSentClientHellos() const;
 
+  // Return connection's overall packet loss rate in 1/10th of percent.
+  int PacketLossRate() const;
+
   // Returns true if |hostname| may be pooled onto this session.  If this
   // is a secure QUIC session, then |hostname| must match the certificate
   // presented during the handshake.
@@ -238,6 +241,7 @@ class NET_EXPORT_PRIVATE QuicClientSession : public QuicClientSessionBase {
   bool read_pending_;
   CompletionCallback callback_;
   size_t num_total_streams_;
+  size_t number_of_handshakes_;
   base::TaskRunner* task_runner_;
   BoundNetLog net_log_;
   base::TimeTicks dns_resolution_end_time_;