Experimental app list: Added a current page indicator to the launcher.

ui/app_list/views/contents_view.cc

Index: ui/app_list/views/contents_view.cc
diff --git a/ui/app_list/views/contents_view.cc b/ui/app_list/views/contents_view.cc
index 452e4fdfc2d17aba57f8218b3e880806ecc1afb7..01dccd9dccd4102a202596e605c9b2880d87e56f 100644
--- a/ui/app_list/views/contents_view.cc
+++ b/ui/app_list/views/contents_view.cc
@@ -46,6 +46,8 @@ ContentsView::ContentsView(AppListMainView* app_list_main_view)
 
 ContentsView::~ContentsView() {
   pagination_model_.RemoveObserver(this);
+  if (contents_switcher_view_)
+    pagination_model_.RemoveObserver(contents_switcher_view_);
 }
 
 void ContentsView::InitNamedPages(AppListModel* model,
@@ -97,6 +99,14 @@ void ContentsView::SetDragAndDropHostOfCurrentAppList(
   apps_container_view_->SetDragAndDropHostOfCurrentAppList(drag_and_drop_host);
 }
 
+void ContentsView::SetContentsSwitcherView(
+    ContentsSwitcherView* contents_switcher_view) {
+  DCHECK(!contents_switcher_view_);
+  contents_switcher_view_ = contents_switcher_view;
+  if (contents_switcher_view_)
+    pagination_model_.AddObserver(contents_switcher_view_);
+}
+
 void ContentsView::SetActivePage(int page_index) {
   if (GetActivePageIndex() == page_index)
     return;
@@ -244,9 +254,9 @@ int ContentsView::AddLauncherPage(views::View* view, int resource_id) {
   int page_index = view_model_->view_size();
   AddChildView(view);
   view_model_->Add(view, page_index);
-  pagination_model_.SetTotalPages(view_model_->view_size());
   if (contents_switcher_view_)
     contents_switcher_view_->AddSwitcherButton(resource_id, page_index);
+  pagination_model_.SetTotalPages(view_model_->view_size());
   return page_index;
 }