Use sockets with unread data if they've never been used before.

net/spdy/spdy_session.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/spdy/spdy_session.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 1662 matching lines @@
   dict->SetBoolean("received_settings", received_settings_);
 
   dict->SetInteger("send_window_size", session_send_window_size_);
   dict->SetInteger("recv_window_size", session_recv_window_size_);
   dict->SetInteger("unacked_recv_window_bytes",
                    session_unacked_recv_window_bytes_);
   return dict;
 }
 
 bool SpdySession::IsReused() const {
-  return buffered_spdy_framer_->frames_received() > 0;
+  return buffered_spdy_framer_->frames_received() > 0 ||

[mmenke, 2014/03/18 15:16:55]

Hrm...  If we always received a settings frame first thing, would this always be
true?

[davidben, 2014/03/18 22:53:55]

SETTINGS frames aren't counted in this. It's oddly named and a somewhat odd
check, but I think it works? It counts:

SYN_STREAM
HEADERS
SYN_REPLY
data frames

+      connection_->reuse_type() == ClientSocketHandle::UNUSED_IDLE;

[mmenke, 2014/03/18 15:16:55]

can we just use connection->is_reused()?  Yes, it will never be REUSED_IDLE,
anyways, but still seems weird to just be checking for UNUSED_IDLE.

[davidben, 2014/03/18 22:53:55]

is_reused() is actually only REUSED_IDLE, not UNUSED_IDLE, which is sort of
bizarre. I haven't looked at all the callers to see if checking both would be
more correct or anything.

 }
 
 bool SpdySession::GetLoadTimingInfo(SpdyStreamId stream_id,
                                     LoadTimingInfo* load_timing_info) const {
   return connection_->GetLoadTimingInfo(stream_id != kFirstStreamId,
                                         load_timing_info);
 }
 
 int SpdySession::GetPeerAddress(IPEndPoint* address) const {
   int rv = ERR_SOCKET_NOT_CONNECTED;
@@ skipping 1345 matching lines @@
     if (!queue->empty()) {
       SpdyStreamId stream_id = queue->front();
       queue->pop_front();
       return stream_id;
     }
   }
   return 0;
 }
 
 }  // namespace net