Pass through the parent_tab_id when creating a new tab.

chrome/browser/sessions/session_restore_android.cc

 // 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.
 
 #include "chrome/browser/sessions/session_restore.h"
 
 #include <vector>
 
 #include "chrome/browser/android/tab_android.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 21 matching lines @@
       sessions::SerializedNavigationEntry::ToNavigationEntries(
           session_tab.navigations, profile);
   content::WebContents* new_web_contents = content::WebContents::Create(
       content::WebContents::CreateParams(context));
   int selected_index = session_tab.normalized_navigation_index();
   new_web_contents->GetController().Restore(
       selected_index,
       content::NavigationController::RESTORE_LAST_SESSION_EXITED_CLEANLY,
       &entries);
 
+  TabAndroid* current_tab = TabAndroid::FromWebContents(web_contents);

[David Trainor- moved to gerrit, 2014/01/07 19:29:30]

Are we sure this can't be null in the new foreground/background case?  I'm fine
either way, just making sure you've thought about that case :).

[aurimas (slooooooooow), 2014/01/07 19:41:26]

SessionRestore::RestoreForeignSessionTab() is called by ForeignSessionHandler <
opening a tab from other devices
RecentlyClosedTabsBridge < opening a tab from recently closed list
RecentlyClosedTabsHandler < opening a tab from recently closed list

All these come from their NTP or new NTP.

+  DCHECK(current_tab);
   if (disposition == CURRENT_TAB) {
-    TabAndroid* current_tab = TabAndroid::FromWebContents(web_contents);
-    DCHECK(current_tab);
     current_tab->SwapTabContents(web_contents, new_web_contents);
     delete web_contents;
   } else {
     DCHECK(disposition == NEW_FOREGROUND_TAB ||
         disposition == NEW_BACKGROUND_TAB);
-    tab_model->CreateTab(new_web_contents);
+    tab_model->CreateTab(new_web_contents, current_tab->GetAndroidId());
   }
   return new_web_contents;
 }
 
 // static
 std::vector<Browser*> SessionRestore::RestoreForeignSessionWindows(
     Profile* profile,
     chrome::HostDesktopType host_desktop_type,
     std::vector<const SessionWindow*>::const_iterator begin,
     std::vector<const SessionWindow*>::const_iterator end) {
   NOTREACHED();
   return std::vector<Browser*>();
 }