Added views::ViewModelT<T>, a type-safe template version of ViewModel.

chrome/browser/ui/views/tabs/tab_strip.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_VIEWS_TABS_TAB_STRIP_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 131 matching lines @@
 
   // Invoked when the title of a tab changes and the tab isn't loading.
   void TabTitleChangedNotLoading(int model_index);
 
   // Retrieves the ideal bounds for the Tab at the specified index.
   const gfx::Rect& ideal_bounds(int tab_data_index) {
     return tabs_.ideal_bounds(tab_data_index);
   }
 
   // Returns the Tab at |index|.
-  Tab* tab_at(int index) const {
-    return static_cast<Tab*>(tabs_.view_at(index));
-  }
+  Tab* tab_at(int index) const { return tabs_.view_at(index); }
 
   // Returns the index of the specified tab in the model coordinate system, or
   // -1 if tab is closing or not valid.
   int GetModelIndexOfTab(const Tab* tab) const;
 
   // Gets the number of Tabs in the tab strip.
   int tab_count() const { return tabs_.view_size(); }
 
   // Cover method for TabStripController::GetCount.
   int GetModelCount() const;
@@ skipping 424 matching lines @@
 
   // -- Member Variables ------------------------------------------------------
 
   // There is a one-to-one mapping between each of the tabs in the
   // TabStripController (TabStripModel) and |tabs_|. Because we animate tab
   // removal there exists a period of time where a tab is displayed but not in
   // the model. When this occurs the tab is removed from |tabs_| and placed in
   // |tabs_closing_map_|. When the animation completes the tab is removed from
   // |tabs_closing_map_|. The painting code ensures both sets of tabs are
   // painted, and the event handling code ensures only tabs in |tabs_| are used.
-  views::ViewModel tabs_;
+  views::ViewModelT<Tab> tabs_;
   TabsClosingMap tabs_closing_map_;
 
   scoped_ptr<TabStripController> controller_;
 
   // The "New Tab" button.
   NewTabButton* newtab_button_;
 
   // Ideal bounds of the new tab button.
   gfx::Rect newtab_button_bounds_;
 
@@ skipping 69 matching lines @@
   bool immersive_style_;
 
   // Our observers.
   typedef ObserverList<TabStripObserver> TabStripObservers;
   TabStripObservers observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TabStrip);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_STRIP_H_