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

net/socket/tcp_client_socket_win.cc

Index: net/socket/tcp_client_socket_win.cc
===================================================================
--- net/socket/tcp_client_socket_win.cc	(revision 90003)
+++ net/socket/tcp_client_socket_win.cc	(working copy)
@@ -323,7 +323,9 @@
       next_connect_state_(CONNECT_STATE_NONE),
       connect_os_error_(0),
       net_log_(BoundNetLog::Make(net_log, NetLog::SOURCE_SOCKET)),
-      previously_disconnected_(false) {
+      previously_disconnected_(false),
+      num_bytes_read_(0),
+      connect_time_micros_(-1) {
   scoped_refptr<NetLog::EventParameters> params;
   if (source.is_valid())
     params = new NetLogSourceParameter("source_dependency", source);
@@ -484,6 +486,7 @@
 
   core_->write_overlapped_.hEvent = WSACreateEvent();
 
+  connect_start_time_ = base::TimeTicks::Now();
   if (!connect(socket_, ai->ai_addr, static_cast<int>(ai->ai_addrlen))) {
     // Connected without waiting!
     //
@@ -522,6 +525,8 @@
   net_log_.EndEvent(NetLog::TYPE_TCP_CONNECT_ATTEMPT, params);
 
   if (result == OK) {
+    connect_time_micros_ = (base::TimeTicks::Now() -
+                            connect_start_time_).ToInternalValue();
     use_history_.set_was_ever_connected();
     return OK;  // Done!
   }
@@ -658,6 +663,14 @@
   return false;
 }
 
+int64 TCPClientSocketWin::NumBytesRead() const {
+  return num_bytes_read_;
+}
+
+int TCPClientSocketWin::GetConnectTimeMicros() const {
+  return connect_time_micros_;
+}
+
 int TCPClientSocketWin::Read(IOBuffer* buf,
                              int buf_len,
                              CompletionCallback* callback) {
@@ -688,6 +701,7 @@
       base::MemoryDebug::MarkAsInitialized(core_->read_buffer_.buf, num);
       base::StatsCounter read_bytes("tcp.read_bytes");
       read_bytes.Add(num);
+      num_bytes_read_ += num;
       if (num > 0)
         use_history_.set_was_used_to_convey_data();
       net_log_.AddByteTransferEvent(NetLog::TYPE_SOCKET_BYTES_RECEIVED, num,
@@ -858,6 +872,7 @@
   if (ok) {
     base::StatsCounter read_bytes("tcp.read_bytes");
     read_bytes.Add(num_bytes);
+    num_bytes_read_ += num_bytes;
     if (num_bytes > 0)
       use_history_.set_was_used_to_convey_data();
     net_log_.AddByteTransferEvent(NetLog::TYPE_SOCKET_BYTES_RECEIVED,