Store AppItems as pages in AppListModel.

ash/shell/app_list.cc

Index: ash/shell/app_list.cc
diff --git a/ash/shell/app_list.cc b/ash/shell/app_list.cc
index 7448de447587175f3a8dbfc7aa39fcc0f53e7b1f..6768a677ee90c61ca9a493b378185c327d875932 100644
--- a/ash/shell/app_list.cc
+++ b/ash/shell/app_list.cc
@@ -195,14 +195,14 @@ class ExampleAppListViewDelegate : public app_list::AppListViewDelegate {
   ExampleAppListViewDelegate() : model_(NULL) {}
 
  private:
-  void PopulateApps(app_list::AppListModel::Apps* apps) {
+  void PopulateApps() {
     for (int i = 0;
          i < static_cast<int>(WindowTypeLauncherItem::LAST_TYPE);
          ++i) {
       WindowTypeLauncherItem::Type type =
           static_cast<WindowTypeLauncherItem::Type>(i);
       std::string id = base::StringPrintf("%d", i);
-      apps->Add(new WindowTypeLauncherItem(id, type));
+      model_->AddItem(new WindowTypeLauncherItem(id, type));
     }
   }
 
@@ -233,7 +233,7 @@ class ExampleAppListViewDelegate : public app_list::AppListViewDelegate {
 
   virtual void InitModel(app_list::AppListModel* model) OVERRIDE {
     model_ = model;
-    PopulateApps(model_->apps());
+    PopulateApps();
     DecorateSearchBox(model_->search_box());
   }