Add Hide and Show to the app list SearchBoxView.

ui/app_list/views/app_list_main_view.cc

 // Copyright 2013 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.
 
 #include "ui/app_list/views/app_list_main_view.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 186 matching lines @@
       pending_icon_loaders_.begin(), pending_icon_loaders_.end(), loader);
   DCHECK(it != pending_icon_loaders_.end());
   pending_icon_loaders_.erase(it);
 
   if (pending_icon_loaders_.empty() && icon_loading_wait_timer_.IsRunning()) {
     icon_loading_wait_timer_.Stop();
     GetWidget()->Show();
   }
 }
 
+void AppListMainView::ChildVisibilityChanged(views::View* child) {
+  // Repaint the AppListView's background which will repaint the background for
+  // the search box.
+  if (child == search_box_view_ && parent())
+    parent()->SchedulePaint();
+}
+
 void AppListMainView::ActivateApp(AppListItem* item, int event_flags) {
   // TODO(jennyz): Activate the folder via AppListModel notification.
   if (item->GetItemType() == AppListFolderItem::kItemType)
     contents_view_->ShowFolderContent(static_cast<AppListFolderItem*>(item));
   else
     item->Activate(event_flags);
 }
 
 void AppListMainView::GetShortcutPathForApp(
     const std::string& app_id,
@@ skipping 35 matching lines @@
   // Resubmit the query via a posted task so that all observers for the
   // uninstall notification are notified.
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&AppListMainView::QueryChanged,
                  weak_ptr_factory_.GetWeakPtr(),
                  search_box_view_));
 }
 
 }  // namespace app_list