Improve accessibility of user image selection screen.

chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
index 6da2ad41e3dbf81e9f24fa5e724b929563d76e1a..44abc35191bb398cd287bde79da466ac45af82d4 100644
--- a/chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.cc
@@ -65,7 +65,10 @@ void UserImageScreenHandler::GetLocalizedStrings(
 void UserImageScreenHandler::Initialize() {
   ListValue image_urls;
   for (int i = 0; i < kDefaultImagesCount; ++i) {
-    image_urls.Append(new StringValue(GetDefaultImageUrl(i)));
+    DictionaryValue* dict = new DictionaryValue();
+    dict->Set("url", new StringValue(GetDefaultImageUrl(i)));
+    dict->Set("title", new StringValue(GetDefaultImageDescription(i)));
+    image_urls.Append(dict);
   }
   web_ui()->CallJavascriptFunction("oobe.UserImageScreen.setUserImages",
                                    image_urls);