Add support for custom entries in <cr_network_select/>.

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

Index: ui/webui/resources/cr_elements/network/cr_network_list.js
diff --git a/ui/webui/resources/cr_elements/network/cr_network_list.js b/ui/webui/resources/cr_elements/network/cr_network_list.js
index 24178c4e6c44876aa877cba11facde124c8980f8..1f9346cb037e35748fcd9d98f9c0c558763424c5 100644
--- a/ui/webui/resources/cr_elements/network/cr_network_list.js
+++ b/ui/webui/resources/cr_elements/network/cr_network_list.js
@@ -38,6 +38,7 @@ Polymer({
 
     /**
      * The list of network state properties for the items to display.
+     * See <cr-network-list-item/> for details.
      *
      * @type {!Array<!CrOnc.NetworkStateProperties>}
      */
@@ -52,7 +53,26 @@ Polymer({
     opened: {
       type: Boolean,
       value: true
-    }
+    },
+
+    /**
+     * Hides all buttons from the list items.
+     */
+    noButtons: {
+      type: Boolean,
+      value: false,
+    },
+
+    /**
+     * This event is fired on each NetworkStateProperties object when it has
+     * state 'Connected'.
+     *
+     * @type {String}
+     */
+    networkConnectedEvent: {
+      type: String,
+      value: null,
+    },
   },
 
   /**