Move ContentsView::NamedPage to AppListModel::ShowState.

ui/app_list/app_list_model.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 UI_APP_LIST_APP_LIST_MODEL_H_
 #define UI_APP_LIST_APP_LIST_MODEL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 21 matching lines @@
 // NOTE: Currently this class observes |top_level_item_list_|. The View code may
 // move entries in the item list directly (but can not add or remove them) and
 // the model needs to notify its observers when this occurs.
 class APP_LIST_EXPORT AppListModel : public AppListItemListObserver {
  public:
   enum Status {
     STATUS_NORMAL,
     STATUS_SYNCING,  // Syncing apps or installing synced apps.
   };
 
+  enum State {
+    STATE_APPS,
+    STATE_SEARCH_RESULTS,
+    STATE_START,
+
+    INVALID_STATE,
+  };
+
   typedef ui::ListModel<SearchResult> SearchResults;
 
   AppListModel();
   ~AppListModel() override;
 
   void AddObserver(AppListModelObserver* observer);
   void RemoveObserver(AppListModelObserver* observer);
 
   void SetStatus(Status status);
 
@@ skipping 119 matching lines @@
   Status status_;
   ObserverList<AppListModelObserver, true> observers_;
   bool folders_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListModel);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_MODEL_H_