Add vox support for reading unnamed folder description and fix a focus bug when app launcher is ope…

ui/app_list/views/folder_header_view.cc

Index: ui/app_list/views/folder_header_view.cc
diff --git a/ui/app_list/views/folder_header_view.cc b/ui/app_list/views/folder_header_view.cc
index 29f84d32b8e39200d2c1af55f1035c79b5223506..fd54984b80f3edf1e4ec4a72f7cc185a3b713589 100644
--- a/ui/app_list/views/folder_header_view.cc
+++ b/ui/app_list/views/folder_header_view.cc
@@ -117,11 +117,23 @@ void FolderHeaderView::Update() {
   folder_name_view_->SetVisible(folder_name_visible_);
   if (folder_name_visible_) {
     folder_name_view_->SetText(base::UTF8ToUTF16(folder_item_->name()));
+    UpdateFolderNameAccessibleName();
   }
 
   Layout();
 }
 
+void FolderHeaderView::UpdateFolderNameAccessibleName() {
+  // Sets |folder_name_view_|'s accessible name to the placeholder text if
+  // |folder_name_view_| is blank; otherwise, clear the accessible name, the
+  // accessible state's value is set to be folder_name_view_->text() by
+  // TextField.
+  base::string16 accessible_name = folder_name_view_->text().empty()
+                                       ? folder_name_placeholder_text_
+                                       : base::string16();
+  folder_name_view_->SetAccessibleName(accessible_name);
+}
+
 const base::string16& FolderHeaderView::GetFolderNameForTest() {
   return folder_name_view_->text();
 }
@@ -198,6 +210,8 @@ void FolderHeaderView::ContentsChanged(views::Textfield* sender,
     delegate_->SetItemName(folder_item_, name);
   folder_item_->AddObserver(this);
 
+  UpdateFolderNameAccessibleName();
+
   Layout();
 }