In Dev build, we would like to see if SSLClientSocketNSS object...

net/socket/ssl_client_socket_nss.cc

Index: net/socket/ssl_client_socket_nss.cc
===================================================================
--- net/socket/ssl_client_socket_nss.cc	(revision 74087)
+++ net/socket/ssl_client_socket_nss.cc	(working copy)
@@ -479,7 +479,8 @@
       predicted_npn_status_(kNextProtoUnsupported),
       predicted_npn_proto_used_(false),
       ssl_host_info_(ssl_host_info),
-      dns_cert_checker_(dns_ctx) {
+      dns_cert_checker_(dns_ctx),
+      valid_thread_id_(base::kInvalidThreadId) {
   EnterFunction("");
 }
 
@@ -590,6 +591,8 @@
   DCHECK(!user_write_buf_);
   DCHECK(!pseudo_connected_);
 
+  EnsureThreadIdAssigned();
+
   net_log_.BeginEvent(NetLog::TYPE_SSL_CONNECT, NULL);
 
   int rv = Init();
@@ -639,17 +642,19 @@
 void SSLClientSocketNSS::Disconnect() {
   EnterFunction("");
 
+  // Shut down anything that may call us back (through buffer_send_callback_,
+  // buffer_recv_callback, or handshake_io_callback_).
+  verifier_.reset();
+  transport_->socket()->Disconnect();
+
+  CHECK(CalledOnValidThread());
+
   // TODO(wtc): Send SSL close_notify alert.
   if (nss_fd_ != NULL) {
     PR_Close(nss_fd_);
     nss_fd_ = NULL;
   }
 
-  // Shut down anything that may call us back (through buffer_send_callback_,
-  // buffer_recv_callback, or handshake_io_callback_).
-  verifier_.reset();
-  transport_->socket()->Disconnect();
-
   // Reset object state
   transport_send_busy_   = false;
   transport_recv_busy_   = false;
@@ -2498,4 +2503,17 @@
   that->UpdateConnectionStatus();
 }
 
+void SSLClientSocketNSS::EnsureThreadIdAssigned() const {
+  base::AutoLock auto_lock(lock_);
+  if (valid_thread_id_ != base::kInvalidThreadId)
+    return;
+  valid_thread_id_ = base::PlatformThread::CurrentId();
+}
+
+bool SSLClientSocketNSS::CalledOnValidThread() const {
+  EnsureThreadIdAssigned();
+  base::AutoLock auto_lock(lock_);
+  return valid_thread_id_ == base::PlatformThread::CurrentId();
+}
+
 }  // namespace net