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 89323)
+++ net/socket/tcp_client_socket_libevent.cc	(working copy)
@@ -142,7 +142,9 @@
       net_log_(BoundNetLog::Make(net_log, NetLog::SOURCE_SOCKET)),
       previously_disconnected_(false),
       use_tcp_fastopen_(false),
-      tcp_fastopen_connected_(false) {
+      tcp_fastopen_connected_(false),
+      num_bytes_read_(0),
+      connect_time_micros_(-1) {
   scoped_refptr<NetLog::EventParameters> params;
   if (source.is_valid())
     params = new NetLogSourceParameter("source_dependency", source);
@@ -303,6 +305,7 @@
 
   // Connect the socket.
   if (!use_tcp_fastopen_) {
+    connect_start_time_ = base::TimeTicks::Now();
     if (!HANDLE_EINTR(connect(socket_, current_ai_->ai_addr,
                               static_cast<int>(current_ai_->ai_addrlen)))) {
       // Connected without waiting!
@@ -344,6 +347,8 @@
   write_socket_watcher_.StopWatchingFileDescriptor();
 
   if (result == OK) {
+    connect_time_micros_ = (base::TimeTicks::Now() -
+                            connect_start_time_).ToInternalValue();
     use_history_.set_was_ever_connected();
     return OK;  // Done!
   }
@@ -433,6 +438,7 @@
   if (nread >= 0) {
     base::StatsCounter read_bytes("tcp.read_bytes");
     read_bytes.Add(nread);
+    num_bytes_read_ += static_cast<int64>(nread);
     if (nread > 0)
       use_history_.set_was_used_to_convey_data();
     net_log_.AddByteTransferEvent(NetLog::TYPE_SOCKET_BYTES_RECEIVED, nread,
@@ -627,6 +633,7 @@
     result = bytes_transferred;
     base::StatsCounter read_bytes("tcp.read_bytes");
     read_bytes.Add(bytes_transferred);
+    num_bytes_read_ += static_cast<int64>(bytes_transferred);
     if (bytes_transferred > 0)
       use_history_.set_was_used_to_convey_data();
     net_log_.AddByteTransferEvent(NetLog::TYPE_SOCKET_BYTES_RECEIVED, result,