Add Hide and Show to the app list SearchBoxView.

ui/app_list/views/app_list_main_view.h

Index: ui/app_list/views/app_list_main_view.h
diff --git a/ui/app_list/views/app_list_main_view.h b/ui/app_list/views/app_list_main_view.h
index 1d79cd576dffa2e7e4a07d9a90294f322cd2b251..a36489bd92e4d56b80bde2d2e189ce9465026834 100644
--- a/ui/app_list/views/app_list_main_view.h
+++ b/ui/app_list/views/app_list_main_view.h
@@ -24,6 +24,7 @@ namespace app_list {
 
 class AppListItem;
 class AppListModel;
+class AppListView;
 class AppListViewDelegate;
 class ApplicationDragAndDropHost;
 class ContentsView;
@@ -38,7 +39,8 @@ class APP_LIST_EXPORT AppListMainView : public views::View,
                                         public SearchResultListViewDelegate {
  public:
   // Takes ownership of |delegate|.
-  explicit AppListMainView(AppListViewDelegate* delegate,
+  explicit AppListMainView(AppListView* app_list_view,
+                           AppListViewDelegate* delegate,
                            PaginationModel* pagination_model,
                            gfx::NativeView parent);
   virtual ~AppListMainView();
@@ -83,6 +85,7 @@ class APP_LIST_EXPORT AppListMainView : public views::View,
 
   // Overridden from SearchBoxViewDelegate:
   virtual void QueryChanged(SearchBoxView* sender) OVERRIDE;
+  virtual void SearchBoxVisibilityChanged(SearchBoxView* sender) OVERRIDE;
 
   // Overridden from SearchResultListViewDelegate:
   virtual void OpenResult(SearchResult* result,
@@ -98,6 +101,7 @@ class APP_LIST_EXPORT AppListMainView : public views::View,
   PaginationModel* pagination_model_;  // Owned by AppListController.
   AppListModel* model_;  // Unowned; ownership is handled by |delegate_|.
 
+  AppListView* app_list_view_;  // Owned by view hierarchy.
   SearchBoxView* search_box_view_;  // Owned by views hierarchy.
   ContentsView* contents_view_;  // Owned by views hierarchy.