Support both preconnection, and pre-resolution for subresources...

chrome/browser/net/preconnect.h

 // Copyright (c) 2006-2010 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.
 
 // A Preconnect instance maintains state while a TCP/IP connection is made, and
 // and then released into the pool of available connections for future use.
 
 #ifndef CHROME_BROWSER_NET_PRECONNECT_H_
 #define CHROME_BROWSER_NET_PRECONNECT_H_
 #pragma once
 
 #include "base/ref_counted.h"
+#include "chrome/browser/net/url_info.h"
 #include "net/base/completion_callback.h"
 #include "net/base/host_port_pair.h"
 #include "net/socket/client_socket_handle.h"
 #include "net/socket/tcp_client_socket_pool.h"
 #include "net/url_request/url_request_context.h"
 
 namespace chrome_browser_net {
 
 class Preconnect : public net::CompletionCallback {
  public:
-  static bool PreconnectOnUIThread(const GURL& url);
+  // Try to preconnect.  Typically motivated by OMNIBOX to reach search service.
+  static void PreconnectOnUIThread(const GURL& url,
+                                   UrlInfo::ResolutionMotivation motivation);
 
-  static void PreconnectOnIOThread(const GURL& url);
+  // Try to preconnect.  Typically used by predictor when a subresource probably
+  // needs a connection.
+  static void PreconnectOnIOThread(const GURL& url,
+                                   UrlInfo::ResolutionMotivation motivation);
 
   static void SetPreconnectDespiteProxy(bool status) {
     preconnect_despite_proxy_ = status;
   }
 
  private:
   Preconnect() {}
 
   // Supply an instance that could have been used in an IO callback, but will
   // never actually be used (because we reset the connection so quickly).
   static Preconnect* callback_instance_;
 
   // IO Callback which whould be performed when the connection is established.
   virtual void RunWithParams(const Tuple1<int>& params);
 
   // Preconnections are currently conservative, and do nothing if there is a
   // chance that a proxy may be used.  This boolean allows proxy settings to
   // be ignored (presumably because a user knows that the proxy won't be doing
   // much work anway).
   static bool preconnect_despite_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(Preconnect);
 };
 }  // chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_PRECONNECT_H_