Implement WebPrescientNetworking to trigger preconnect from Blink

chrome/browser/net/predictor.h

 // 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.
 
 // A Predictor object is instantiated once in the browser process, and manages
 // both preresolution of hostnames, as well as TCP/IP preconnection to expected
 // subresources.
 // Most hostname lists are provided by the renderer processes, and include URLs
 // that *might* be used in the near future by the browsing user.  One goal of
 // this class is to cause the underlying DNS structure to lookup a hostname
@@ skipping 99 matching lines @@
                                     PrefService* local_state,
                                     IOThread* io_thread,
                                     net::URLRequestContextGetter* getter);
 
   // The Omnibox has proposed a given url to the user, and if it is a search
   // URL, then it also indicates that this is preconnectable (i.e., we could
   // preconnect to the search server).
   void AnticipateOmniboxUrl(const GURL& url, bool preconnectable);
 
   // Preconnect a URL and all of its subresource domains.
-  void PreconnectUrlAndSubresources(const GURL& url);
+  void PreconnectUrlAndSubresources(const GURL& url,
+                                    UrlInfo::ResolutionMotivation motivation,
+                                    uint32_t motivationVariationId);
 
   static UrlList GetPredictedUrlListAtStartup(PrefService* user_prefs,
                                               PrefService* local_state);
 
   static void set_max_queueing_delay(int max_queueing_delay_ms);
 
   static void set_max_parallel_resolves(size_t max_parallel_resolves);
 
   virtual void ShutdownOnUIThread(PrefService* user_prefs);
 
@@ skipping 383 matching lines @@
       PrefService* user_prefs,
       PrefService* local_state,
       IOThread* io_thread,
       net::URLRequestContextGetter* getter) OVERRIDE;
   virtual void ShutdownOnUIThread(PrefService* user_prefs) OVERRIDE;
 };
 
 }  // namespace chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_PREDICTOR_H_