Fix test (#8536)

examples/flutter_gallery/lib/demo/cupertino/cupertino_dialog_demo.dart

@@ -69,6 +69,7 @@ class _CupertinoDialogDemoState extends State<CupertinoDialogDemo> {
           new CupertinoButton(
             child: new Text('Alert with Title'),
             color: CupertinoButton.kBlue,
+            padding: new EdgeInsets.symmetric(vertical: 16.0, horizontal: 36.0),
             onPressed: () {
               showDemoDialog<String>(
                 context: context,

examples/flutter_gallery/test_driver/transitions_perf_test.dart

@@ -18,7 +18,7 @@ final List<String> demoTitles = <String>[
   'Pesto',
   'Shrine',
   'Contact profile',
-  // Components
+  // Material Components
   'Bottom navigation',
   'Buttons',
   'Cards',
@@ -46,6 +46,12 @@ final List<String> demoTitles = <String>[
   'Tabs',
   'Text fields',
   'Tooltips',
+  // Cupertino Components
+  'Activity Indicator',
+  'Buttons',
+  'Dialogs',
+  'Sliders',
+  'Switches',
   // Style
   'Colors',
   'Typography'
@@ -54,6 +60,7 @@ final List<String> demoTitles = <String>[
 // Subset of [demoTitles] that needs frameSync turned off.
 final List<String> unsynchedDemoTitles = <String>[
   'Progress indicators',
+  'Activity Indicator',
 ];
 
 final FileSystem _fs = const LocalFileSystem();