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

ash/shelf/shelf_view.cc

Index: ash/shelf/shelf_view.cc
diff --git a/ash/shelf/shelf_view.cc b/ash/shelf/shelf_view.cc
index 42545c714b8dacc1fcda101f61be301d24ad2b5f..a48fa338b6d172859207dd98fe775e82838bc69a 100644
--- a/ash/shelf/shelf_view.cc
+++ b/ash/shelf/shelf_view.cc
@@ -222,7 +222,7 @@ bool ShelfMenuModelAdapter::ShouldReserveSpaceForSubmenuIndicator() const {
 // the ViewModel.
 class ShelfFocusSearch : public views::FocusSearch {
  public:
-  explicit ShelfFocusSearch(views::ViewModel* view_model)
+  explicit ShelfFocusSearch(views::ViewModel<views::View>* view_model)
       : FocusSearch(NULL, true, true),
         view_model_(view_model) {}
   virtual ~ShelfFocusSearch() {}
@@ -252,7 +252,7 @@ class ShelfFocusSearch : public views::FocusSearch {
   }
 
  private:
-  views::ViewModel* view_model_;
+  views::ViewModel<views::View>* view_model_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfFocusSearch);
 };
@@ -369,7 +369,7 @@ ShelfView::ShelfView(ShelfModel* model,
                      ShelfLayoutManager* manager)
     : model_(model),
       delegate_(delegate),
-      view_model_(new views::ViewModel),
+      view_model_(new views::ViewModel<views::View>),
       first_visible_index_(0),
       last_visible_index_(-1),
       overflow_button_(NULL),