ash: Rename more Launcher classes to Shelf*.

ash/shelf/shelf_menu_model.h

Index: ash/shelf/shelf_menu_model.h
diff --git a/ash/shelf/shelf_menu_model.h b/ash/shelf/shelf_menu_model.h
new file mode 100644
index 0000000000000000000000000000000000000000..18e1dd033e765896c84d7c9abcb4277b5affa272
--- /dev/null
+++ b/ash/shelf/shelf_menu_model.h
@@ -0,0 +1,29 @@
+// Copyright 2013 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 ASH_SHELF_SHELF_MENU_MODEL_H_
+#define ASH_SHELF_SHELF_MENU_MODEL_H_
+
+#include "ash/ash_export.h"
+#include "ui/base/models/simple_menu_model.h"
+
+namespace ash {
+
+// A special menu model which keeps track of an "active" menu item.
+class ASH_EXPORT ShelfMenuModel : public ui::SimpleMenuModel {
+ public:
+  explicit ShelfMenuModel(ui::SimpleMenuModel::Delegate* delegate)
+      : ui::SimpleMenuModel(delegate) {}
+
+  // Returns |true| when the given |command_id| is active and needs to be drawn
+  // in a special state.
+  virtual bool IsCommandActive(int command_id) const = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ShelfMenuModel);
+};
+
+}  // namespace ash
+
+#endif  // ASH_SHELF_SHELF_MENU_MODEL_H_