Pass through the parent_tab_id when creating a new tab.

chrome/browser/ui/android/tab_model/tab_model.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.
 
 #ifndef CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_
 #define CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/sessions/session_id.h"
 #include "chrome/browser/sync/glue/synced_window_delegate.h"
@@ skipping 29 matching lines @@
 
   virtual int GetTabCount() const = 0;
   virtual int GetActiveIndex() const = 0;
   virtual content::WebContents* GetWebContentsAt(int index) const = 0;
   virtual TabAndroid* GetTabAt(int index) const = 0;
 
   virtual void SetActiveIndex(int index) = 0;
   virtual void CloseTabAt(int index) = 0;
 
   // Used for restoring tabs from synced foreign sessions.
-  virtual void CreateTab(content::WebContents* web_contents) = 0;
+  virtual void CreateTab(content::WebContents* web_contents,
+                         int parent_tab_id) = 0;
 
   // Used by Developer Tools to create a new tab with a given URL.
   // Replaces CreateTabForTesting.
   virtual content::WebContents* CreateNewTabForDevTools(const GURL& url) = 0;
 
   // Return true if we are currently restoring sessions asynchronously.
   virtual bool IsSessionRestoreInProgress() const = 0;
 
   virtual void OpenClearBrowsingData() const = 0;
 
@@ skipping 24 matching lines @@
   // across sessions.
   SessionID session_id_;
 
   // The Registrar used to register TabModel for notifications.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(TabModel);
 };
 
 #endif  // CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_