Deciding best connection to schedule requests on based on cwnd and idle time

net/socket/tcp_client_socket_libevent.cc

Index: net/socket/tcp_client_socket_libevent.cc
===================================================================
--- net/socket/tcp_client_socket_libevent.cc	(revision 86260)
+++ net/socket/tcp_client_socket_libevent.cc	(working copy)
@@ -219,6 +219,7 @@
 
   // Connect the socket.
   if (!use_tcp_fastopen_) {
+    connect_start_time_ = base::Time::Now();
     if (!HANDLE_EINTR(connect(socket_, current_ai_->ai_addr,
                               static_cast<int>(current_ai_->ai_addrlen)))) {
       // Connected without waiting!
@@ -260,6 +261,9 @@
   write_socket_watcher_.StopWatchingFileDescriptor();
 
   if (result == OK) {
+    rtt_ms_ = static_cast<double>((base::Time::Now() -
+                                   connect_start_time_).InMicroseconds())
+        / 1000.0;
     use_history_.set_was_ever_connected();
     return OK;  // Done!
   }
@@ -349,6 +353,7 @@
   if (nread >= 0) {
     base::StatsCounter read_bytes("tcp.read_bytes");
     read_bytes.Add(nread);
+    num_bytes_read_ += nread;
     if (nread > 0)
       use_history_.set_was_used_to_convey_data();
     LogByteTransfer(