[polymer] Uses setAttribute() in DisplayItemListItem.created()

tracing/tracing/ui/extras/chrome/cc/display_item_list_item.html

Index: tracing/tracing/ui/extras/chrome/cc/display_item_list_item.html
diff --git a/tracing/tracing/ui/extras/chrome/cc/display_item_list_item.html b/tracing/tracing/ui/extras/chrome/cc/display_item_list_item.html
index dea9921b12b83d04eaf384937df60d2bbaecd65b..a493302507955aba745c28bd9ec597cf4b9c0846 100644
--- a/tracing/tracing/ui/extras/chrome/cc/display_item_list_item.html
+++ b/tracing/tracing/ui/extras/chrome/cc/display_item_list_item.html
@@ -89,10 +89,12 @@ An element displaying basic information about a display item in a list view.
     is: 'tr-ui-e-chrome-cc-display-item-list-item',
 
     created: function() {
-      this.name = '';
-      this.rawDetails = '';
-      this.richDetails = undefined;
-      this.data_ = undefined;
+      // TODO(charliea): Why is setAttribute necessary here but not below? We
+      // should reach out to the Polymer team to figure out.
+      this.setAttribute('name', '');
+      this.setAttribute('rawDetails', '');
+      this.setAttribute('richDetails', undefined);
+      this.setAttribute('data_', undefined);
     },
 
     get data() {