Add the UMA recording recall of URLRequests preconnected.

net/base/network_delegate.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/base/network_delegate.h"
 
 #include "base/logging.h"
 #include "net/base/load_flags.h"
 #include "net/url_request/url_request.h"
 
 namespace net {
 
+void NetworkDelegate::NotifyBeforePreconnect(const GURL& url) {
+  DCHECK(CalledOnValidThread());
+  OnBeforePreconnect(url);
+}
+
 int NetworkDelegate::NotifyBeforeURLRequest(
     URLRequest* request, const CompletionCallback& callback,
     GURL* new_url) {
   DCHECK(CalledOnValidThread());
   DCHECK(request);
   DCHECK(!callback.is_null());
   return OnBeforeURLRequest(request, callback, new_url);
 }
 
 int NetworkDelegate::NotifyBeforeSendHeaders(
@@ skipping 118 matching lines @@
   return OnBeforeSocketStreamConnect(socket, callback);
 }
 
 void NetworkDelegate::NotifyRequestWaitStateChange(const URLRequest& request,
                                                    RequestWaitState state) {
   DCHECK(CalledOnValidThread());
   OnRequestWaitStateChange(request, state);
 }
 
 }  // namespace net