Add Hide and Show to the app list SearchBoxView.

ui/app_list/views/app_list_main_view.cc

Index: ui/app_list/views/app_list_main_view.cc
diff --git a/ui/app_list/views/app_list_main_view.cc b/ui/app_list/views/app_list_main_view.cc
index 0b75097bf82750b8fc66c25de9405bfb03d7b361..121d57aeabfdf03865b478674f956db2c4e92e85 100644
--- a/ui/app_list/views/app_list_main_view.cc
+++ b/ui/app_list/views/app_list_main_view.cc
@@ -20,6 +20,7 @@
 #include "ui/app_list/pagination_model.h"
 #include "ui/app_list/search_box_model.h"
 #include "ui/app_list/views/app_list_item_view.h"
+#include "ui/app_list/views/app_list_view.h"
 #include "ui/app_list/views/contents_switcher_view.h"
 #include "ui/app_list/views/contents_view.h"
 #include "ui/app_list/views/search_box_view.h"
@@ -79,12 +80,14 @@ class AppListMainView::IconLoader : public AppListItemObserver {
 ////////////////////////////////////////////////////////////////////////////////
 // AppListMainView:
 
-AppListMainView::AppListMainView(AppListViewDelegate* delegate,
+AppListMainView::AppListMainView(AppListView* app_list_view,
+                                 AppListViewDelegate* delegate,
                                  PaginationModel* pagination_model,
                                  gfx::NativeView parent)
     : delegate_(delegate),
       pagination_model_(pagination_model),
       model_(delegate->GetModel()),
+      app_list_view_(app_list_view),
       search_box_view_(NULL),
       contents_view_(NULL),
       weak_ptr_factory_(this) {
@@ -230,6 +233,13 @@ void AppListMainView::QueryChanged(SearchBoxView* sender) {
     delegate_->StopSearch();
 }
 
+void AppListMainView::SearchBoxVisibilityChanged(SearchBoxView* sender) {
+  // Repaint the AppListView's background which will repaint the background for
+  // the search box.
+  if (app_list_view_)
+    app_list_view_->RepaintBackground();
+}
+
 void AppListMainView::OpenResult(SearchResult* result,
                                  bool auto_launch,
                                  int event_flags) {