Back button should kill interactive flex app

sky/sdk/example/rendering/interactive_flex.dart

Index: sky/sdk/example/rendering/interactive_flex.dart
diff --git a/sky/sdk/example/rendering/interactive_flex.dart b/sky/sdk/example/rendering/interactive_flex.dart
index 6553c8bf0462418bb57d8f4e9512e235cb08d6d9..398a14d6eb02c6ca9e11a34dc7ad859606452b48 100644
--- a/sky/sdk/example/rendering/interactive_flex.dart
+++ b/sky/sdk/example/rendering/interactive_flex.dart
@@ -5,7 +5,9 @@
 import 'dart:sky';
 import 'dart:math' as math;
 
+import 'package:mojom/intents/intents.mojom.dart';
 import 'package:sky/mojo/net/image_cache.dart' as image_cache;
+import 'package:sky/mojo/shell.dart' as shell;
 import 'package:sky/painting/text_style.dart';
 import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/flex.dart';
@@ -45,6 +47,11 @@ void handleEvent(event) {
       image.growth = math.max(0.0, image.growth + event.x - touches[event.pointer].x);
     touches[event.pointer] = new Touch(event.x, event.y);
   }
+  if (event.type == "back") {
+    ActivityManagerProxy activityManager = new ActivityManagerProxy.unbound();
+    shell.requestService('mojo:sky_viewer', activityManager);
+    activityManager.ptr.finishCurrentActivity();
+  }

[abarth-chromium, 2015/07/07 18:10:26]

Should we factor this into a library since we have the code twice now?  Maybe
sky/sdk/lib/mojo/activity.dart ?

[jackson, 2015/07/07 19:17:30]

Done.

 }
 
 void main() {