Implement WebPrescientNetworking to trigger preconnect from Blink

chrome/browser/net/predictor.h

Index: chrome/browser/net/predictor.h
diff --git a/chrome/browser/net/predictor.h b/chrome/browser/net/predictor.h
index 8db8a3856bd81f9ed24f27bd09309da4123933c3..4a3f05ebc7d10967d989978e5968e1bd6559e1df 100644
--- a/chrome/browser/net/predictor.h
+++ b/chrome/browser/net/predictor.h
@@ -117,7 +117,9 @@ class Predictor {
   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);