Introduce chrome://flags/#network-prediction-options-for-service-worker

chrome/browser/net/predictor_tab_helper.h

Index: chrome/browser/net/predictor_tab_helper.h
diff --git a/chrome/browser/net/predictor_tab_helper.h b/chrome/browser/net/predictor_tab_helper.h
index 643dbc9de9055f15f51bc4439a8dcd60b753c7da..7172aec5b55ed3ea05482e7502f870a710841898 100644
--- a/chrome/browser/net/predictor_tab_helper.h
+++ b/chrome/browser/net/predictor_tab_helper.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_NET_PREDICTOR_TAB_HELPER_H_
 
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/reload_type.h"
@@ -36,7 +37,10 @@ class PredictorTabHelper
   explicit PredictorTabHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<PredictorTabHelper>;
 
-  void PreconnectUrl(const GURL& url);
+  void HandleNavigation(const GURL& url);
+  void DidStartServiceWorkerForNavigaionPreconnect(const GURL& url,
+                                                   bool success);
+  void PreconnectUrlWithPredictor(const GURL& url);
 
   // This boolean is set to true after a call to
   // DidStartNavigationToPendingEntry, which fires off predictive preconnects.
@@ -47,6 +51,8 @@ class PredictorTabHelper
   // especially on Android.
   bool predicted_from_pending_entry_;
 
+  base::WeakPtrFactory<PredictorTabHelper> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PredictorTabHelper);
 };