Fix Loading text for settings-dropdown-menu

chrome/test/data/webui/settings/dropdown_menu_tests.js

Index: chrome/test/data/webui/settings/dropdown_menu_tests.js
diff --git a/chrome/test/data/webui/settings/dropdown_menu_tests.js b/chrome/test/data/webui/settings/dropdown_menu_tests.js
index 77c3768ded422a0a4a0752bf58fe4f5f3ec5307a..a10a09f51d98e939201e9f0b450c79b98dcd095c 100644
--- a/chrome/test/data/webui/settings/dropdown_menu_tests.js
+++ b/chrome/test/data/webui/settings/dropdown_menu_tests.js
@@ -92,6 +92,33 @@ cr.define('settings_dropdown_menu', function() {
         // Pref should not have changed.
         assertEquals('f', dropdown.pref.value);
       });
+
+      test('delay setting options', function testDelayedOptions(done) {
+        dropdown.pref = {
+          key: 'test.number2',
+          type: chrome.settingsPrivate.PrefType.NUMBER,
+          value: 200,
+        };
+

[dschuyler, 2016/08/17 23:59:46]

Would it make sense to have check that
the label is shown here and...

+        setTimeout(function() {
+          assertEquals(
+              loadTimeData.getValue('loading'), dropdown.$.dropdownMenu.label);

[dschuyler, 2016/08/17 23:59:46]

...that the label is not shown here?

I think we want the "Loading..." to be 
shown while we don't have the options
loaded and the "Loading..." to go away
when we do have the menuOptions set.

+          assertTrue(dropdown.$.dropdownMenu.disabled);
+          assertEquals(undefined, selectable.selected);
+
+          dropdown.menuOptions = [{value: 100, name: 'Option 100'},
+                                  {value: 200, name: 'Option 200'},
+                                  {value: 300, name: 'Option 300'},
+                                  {value: 400, name: 'Option 400'}];
+          Polymer.dom.flush();
+
+          // Dropdown menu enables itself and selects the new menu option
+          // correpsonding to the pref value.
+          assertFalse(dropdown.$.dropdownMenu.disabled);
+          assertEquals('200', selectable.selected);
+          done();
+        }, 100);
+      });
     });
   }