MD-Settings: Add a11y label for network summary items.

ui/webui/resources/cr_elements/network/cr_network_list_item.js

Index: ui/webui/resources/cr_elements/network/cr_network_list_item.js
diff --git a/ui/webui/resources/cr_elements/network/cr_network_list_item.js b/ui/webui/resources/cr_elements/network/cr_network_list_item.js
index a6946ca5a8078deb7bf1829871675081b6682df2..e483e417b8a5db3aa0270243488bd8018ac1f175 100644
--- a/ui/webui/resources/cr_elements/network/cr_network_list_item.js
+++ b/ui/webui/resources/cr_elements/network/cr_network_list_item.js
@@ -55,6 +55,13 @@ Polymer({
       value: -1,
       reflectToAttribute: true,
     },
+
+    /** Expose the itemName so it can be used as a label for a11y.  */
+    itemName: {
+      type: String,
+      notify: true,
+      computed: 'getItemName_(item, isListItem)',
+    }
   },
 
   behaviors: [CrPolicyNetworkBehavior],