[sync] Prevent sessions flare on startup

chrome/browser/sync/sessions/sync_sessions_router_tab_helper.h

 // Copyright 2017 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.
 
 #ifndef CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSIONS_ROUTER_TAB_HELPER_H_
 #define CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSIONS_ROUTER_TAB_HELPER_H_
 
 #include "components/sessions/core/session_id.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
@@ skipping 42 matching lines @@
                      const GURL& validated_url) override;
   void DidOpenRequestedURL(content::WebContents* new_contents,
                            content::RenderFrameHost* source_render_frame_host,
                            const GURL& url,
                            const content::Referrer& referrer,
                            WindowOpenDisposition disposition,
                            ui::PageTransition transition,
                            bool started_from_context_menu,
                            bool renderer_initiated) override;
 
-  void NotifyRouter();
+  void NotifyRouter(bool page_load_completed = false);
 
   // |router_| is a KeyedService and is guaranteed to outlive |this|.
   SyncSessionsWebContentsRouter* router_;
   // Tab id of the tab from which this tab was created. Example events that
   // create this relationship:
   // * From context menu, "Open link in new tab".
   // * From context menu, "Open link in new window".
   // * Ctrl-click.
   // * Click on a link with target='_blank'.
   SessionID::id_type source_tab_id_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncSessionsRouterTabHelper);
 };
 
 }  // namespace sync_sessions
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSIONS_ROUTER_TAB_HELPER_H_