Add the UMA recording recall of URLRequests preconnected.

chrome/browser/net/chrome_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 "chrome/browser/net/chrome_network_delegate.h"
 
 #include <stdlib.h>
 
 #include <vector>
 
@@ skipping 427 matching lines @@
 Value* ChromeNetworkDelegate::SessionNetworkStatsInfoToValue() const {
   DictionaryValue* dict = new DictionaryValue();
   // Use strings to avoid overflow.  base::Value only supports 32-bit integers.
   dict->SetString("session_received_content_length",
                   base::Int64ToString(received_content_length_));
   dict->SetString("session_original_content_length",
                   base::Int64ToString(original_content_length_));
   return dict;
 }
 
+void ChromeNetworkDelegate::OnBeforePreconnect(
+    const GURL& url) {
+  if (connect_interceptor_)
+    connect_interceptor_->WitnessPreconnect(url);
+}
+
 int ChromeNetworkDelegate::OnBeforeURLRequest(
     net::URLRequest* request,
     const net::CompletionCallback& callback,
     GURL* new_url) {
 #if defined(ENABLE_CONFIGURATION_POLICY)
   // TODO(joaodasilva): This prevents extensions from seeing URLs that are
   // blocked. However, an extension might redirect the request to another URL,
   // which is not blocked.
   if (url_blacklist_manager_ &&
       url_blacklist_manager_->IsRequestBlocked(*request)) {
@@ skipping 317 matching lines @@
 
 void ChromeNetworkDelegate::AccumulateContentLength(
     int64 received_content_length, int64 original_content_length) {
   DCHECK_GE(received_content_length, 0);
   DCHECK_GE(original_content_length, 0);
   StoreAccumulatedContentLength(received_content_length,
                                 original_content_length);
   received_content_length_ += received_content_length;
   original_content_length_ += original_content_length;
 }