Add a11y description to announce the number of apps in a folder

In the folder icon UI refresh, we added the app counter on the folder
icon so that the users can see how many apps are in a folder at the
first glance. To provide an equitable experience for chromevox users,
This cl adds the a11y string to announce the number of apps in a folder
when focusing on it.

screenshot: https://screenshot.googleplex.com/64fUyz6n8gnWPwj

Bug: b:274728929
Change-Id: If9d7c03901673291cf204f2dad12d840e8b8ddbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4362800
Commit-Queue: Wen-Chien Wang <wcwang@chromium.org>
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1120847}

ash/app_list/views/app_list_item_view.cc

@@ -902,26 +902,47 @@ void AppListItemView::GetAccessibleNodeData(ui::AXNodeData* node_data) {
     return;
   }
 
+  // The list of descriptions to be announced.
+  std::vector<std::u16string> descriptions;
+
+  if (item_weak_->is_folder() &&
+      features::IsAppCollectionFolderRefreshEnabled()) {
+    // For folder items, announce the number of apps in the folder.
+    std::u16string app_count_announcement = l10n_util::GetPluralStringFUTF16(
+        IDS_APP_LIST_FOLDER_NUMBER_OF_APPS_ACCESSIBILE_DESCRIPTION,
+        item_weak_->AsFolderItem()->ChildItemCount());
+    descriptions.push_back(app_count_announcement);
+  }
+
   auto app_status = item_weak_->app_status();
+  std::u16string app_status_description;
   switch (app_status) {
     case AppStatus::kBlocked:
-      node_data->SetDescription(
+      app_status_description =
           ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
-              IDS_APP_LIST_BLOCKED_APP));
+              IDS_APP_LIST_BLOCKED_APP);
       break;
     case AppStatus::kPaused:
-      node_data->SetDescription(
+      app_status_description =
           ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
-              IDS_APP_LIST_PAUSED_APP));
+              IDS_APP_LIST_PAUSED_APP);
       break;
     default:
       if (item_weak_->is_new_install()) {
-        node_data->SetDescription(
+        app_status_description =
             ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
-                IDS_APP_LIST_NEW_INSTALL_ACCESSIBILE_DESCRIPTION));
+                IDS_APP_LIST_NEW_INSTALL_ACCESSIBILE_DESCRIPTION);
       }
       break;
   }
+  if (!app_status_description.empty()) {
+    descriptions.push_back(app_status_description);
+  }
+
+  // Set the concatenated descriptions.
+  if (!descriptions.empty()) {
+    node_data->SetDescription(base::JoinString(descriptions, u" "));
+  }
 }
 
 void AppListItemView::OnContextMenuModelReceived(

ash/ash_strings.grd

@@ -6039,6 +6039,11 @@ New install
       <message name="IDS_APP_LIST_FOLDER_BUTTON_ACCESSIBILE_NAME" desc="The spoken feedback text for navigating to a folder button in top level app list">
         Folder <ph name="folder_name">$1<ex>OEM Apps</ex></ph>
       </message>
+      <message name="IDS_APP_LIST_FOLDER_NUMBER_OF_APPS_ACCESSIBILE_DESCRIPTION" desc="The spoken feedback text that announces the number of apps in a folder when navigating to the folder button in top level app list">
+        {NUM_APPS, plural,
+         =1 {1 app}
+         other {# apps}}
+      </message>
       <message name="IDS_APP_LIST_FOLDER_CLOSE_FOLDER_ACCESSIBILE_NAME" desc="The spoken feedback text for closing an app launcher folder">
         Close folder
       </message>

ash/ash_strings_grd/IDS_APP_LIST_FOLDER_NUMBER_OF_APPS_ACCESSIBILE_DESCRIPTION.png.sha1

@@ -0,0 +1 @@
+eba145d904aa0b997a6a49ef2cc6824b262a6a2e