Add tiles to the experimental app list start page.

ui/app_list/views/start_page_view.h

 // Copyright 2014 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_START_PAGE_VIEW_H_
 #define UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_
 
 #include "base/basictypes.h"
+#include "ui/app_list/app_list_view_delegate_observer.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/view.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace app_list {
 
 class AppListMainView;
+class AppListModel;
+class AppListViewDelegate;
+class TileItemView;
 
 // The start page for the experimental app list.
-class StartPageView : public views::View, public views::ButtonListener {
+class StartPageView : public views::View,
+                      public views::ButtonListener,
+                      public AppListViewDelegateObserver {
  public:
   StartPageView(AppListMainView* app_list_main_view,
-                content::WebContents* start_page_web_contents);
+                AppListViewDelegate* view_delegate);
   virtual ~StartPageView();
 
   void Reset();
 
  private:
+  TileItemView* GetTileViewAt(int index);
+
   // Overridden from views::ButtonListener:
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;
 
+  // Overridden from AppListViewDelegateObserver:
+  virtual void OnProfilesChanged() OVERRIDE;
+
   // The parent view of ContentsView which is the parent of this view.
   AppListMainView* app_list_main_view_;
 
+  AppListViewDelegate* view_delegate_;  // Owned by AppListView.
+
   views::View* instant_container_;  // Owned by views hierarchy.
+  views::View* tiles_container_;    // Owned by views hierarchy.
 
   DISALLOW_COPY_AND_ASSIGN(StartPageView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_