Upstream session_backend_android.

chrome/browser/sessions/session_types.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_SESSIONS_SESSION_TYPES_H_
 #define CHROME_BROWSER_SESSIONS_SESSION_TYPES_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 112 matching lines @@
   bool is_overriding_user_agent_;
 };
 
 // SessionTab ----------------------------------------------------------------
 
 // SessionTab corresponds to a NavigationController.
 struct SessionTab {
   SessionTab();
   virtual ~SessionTab();
 
+  // Since the current_navigation_index can be larger than the index for number
+  // of navigations in the current sessions (chrome://newtab is not stored), we
+  // must perform bounds checking.
+  // Returns a normalized bounds-checked navigation_index.
+  int normalized_navigation_index() const {
+    return std::max(0, std::min(current_navigation_index,
+                                static_cast<int>(navigations.size() - 1)));
+  }
+
   // Unique id of the window.
   SessionID window_id;
 
   // Unique if of the tab.
   SessionID tab_id;
 
   // Visual index of the tab within its window. There may be gaps in these
   // values.
   //
   // NOTE: this is really only useful for the SessionService during
@@ skipping 77 matching lines @@
   // Is the window maximized, minimized, or normal?
   ui::WindowShowState show_state;
 
   std::string app_name;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SessionWindow);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_SESSION_TYPES_H_