Notify launcher page with onTransitionChanged event

ui/app_list/views/contents_view.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_VIEWS_CONTENTS_VIEW_H_
 #define UI_APP_LIST_VIEWS_CONTENTS_VIEW_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 60 matching lines @@
 
   // Sets the active launcher page and animates the pages into place.
   void SetActivePage(int page_index);
 
   // The index of the currently active launcher page.
   int GetActivePageIndex() const;
 
   // True if |state| is the current active laucher page.
   bool IsStateActive(AppListModel::State state) const;
 
-  // Gets the index of a launcher page in |view_model_|, by State. Returns
+  // Gets the index of a launcher page in |view_model_| by State. Returns
   // -1 if there is no view for |state|.
   int GetPageIndexForState(AppListModel::State state) const;
 
+  // Gets the State of a launcher page in |view_model_| by index. Returns
+  // INVALID_STATE if there is no State for |index|.
+  AppListModel::State GetStateForPageIndex(int index) const;
+
   int NumLauncherPages() const;
 
   void Prerender();
 
   AppsContainerView* apps_container_view() { return apps_container_view_; }
   StartPageView* start_page_view() { return start_page_view_; }
   SearchResultListView* search_results_view() { return search_results_view_; }
   views::View* GetPageView(int index);
 
   // Adds a blank launcher page. For use in tests only.
   void AddBlankPageForTesting();
 
   // Returns the pagination model for the ContentsView.
-  const PaginationModel& pagination_model() { return pagination_model_; }
+  PaginationModel* pagination_model() { return &pagination_model_; }
 
   // Returns search box bounds to use for content views that do not specify
   // their own custom layout.
   gfx::Rect GetDefaultSearchBoxBounds() const;
 
   // Returns the content area bounds to use for content views that do not
   // specify their own custom layout.
   gfx::Rect GetDefaultContentsBounds() const;
 
   // Overridden from views::View:
@@ skipping 67 matching lines @@
 
   // Manages the pagination for the launcher pages.
   PaginationModel pagination_model_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentsView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_CONTENTS_VIEW_H_