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

ash/shelf/shelf_view.h

Index: ash/shelf/shelf_view.h
diff --git a/ash/shelf/shelf_view.h b/ash/shelf/shelf_view.h
index e4344e6aa7f15283af20f94059765fce5e75f582..eabf429c5c06fff07a5eb20753bdbf4d0fe69127 100644
--- a/ash/shelf/shelf_view.h
+++ b/ash/shelf/shelf_view.h
@@ -18,6 +18,7 @@
 #include "ui/views/controls/button/button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/view.h"
+#include "ui/views/view_model.h"
 
 namespace ui {
 class MenuModel;
@@ -26,7 +27,6 @@ class MenuModel;
 namespace views {
 class BoundsAnimator;
 class MenuRunner;
-class ViewModel;
 }
 
 namespace ash {
@@ -133,7 +133,7 @@ class ASH_EXPORT ShelfView : public views::View,
   virtual void EndDrag(bool cancel) OVERRIDE;
 
   // Return the view model for test purposes.
-  const views::ViewModel* view_model_for_test() const {
+  const views::ViewModel<views::View>* view_model_for_test() const {
     return view_model_.get();
   }
 
@@ -331,7 +331,7 @@ class ASH_EXPORT ShelfView : public views::View,
 
   // Used to manage the set of active launcher buttons. There is a view per
   // item in |model_|.
-  scoped_ptr<views::ViewModel> view_model_;
+  scoped_ptr<views::ViewModel<views::View>> view_model_;
 
   // Index of first visible launcher item.
   int first_visible_index_;