Transfer serviceworker state during cross site navigations too.

content/browser/service_worker/service_worker_provider_host.h

Index: content/browser/service_worker/service_worker_provider_host.h
diff --git a/content/browser/service_worker/service_worker_provider_host.h b/content/browser/service_worker/service_worker_provider_host.h
index 04fb21d0a2ba249c87600c0aa371ed9994f89ff2..ea6c91f9a298ec26a86941ac2eac49f52a4d6d4d 100644
--- a/content/browser/service_worker/service_worker_provider_host.h
+++ b/content/browser/service_worker/service_worker_provider_host.h
@@ -131,6 +131,16 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
   // be removed in destructor.
   void AddScopedProcessReferenceToPattern(const GURL& pattern);
 
+  // Methods to support cross site navigations.
+  void PrepareForCrossSiteTransfer();
+  void CompleteCrossSiteTransfer(
+      int new_process_id,
+      int new_provider_id,
+      ServiceWorkerDispatcherHost* dispatcher_host);
+  ServiceWorkerDispatcherHost* dispatcher_host() const {
+    return dispatcher_host_;
+  }
+
  private:
   friend class ServiceWorkerProviderHostTest;
   friend class ServiceWorkerWriteToCacheJobTest;
@@ -155,8 +165,8 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
   void IncreaseProcessReference(const GURL& pattern);
   void DecreaseProcessReference(const GURL& pattern);
 
-  const int process_id_;
-  const int provider_id_;
+  int process_id_;
+  int provider_id_;
   GURL document_url_;
   GURL topmost_frame_url_;