samples/pop_pop_win: now based on StageXL

samples/pop_pop_win/lib/platform_target.dart

 library ppw_platform;
 
 import 'dart:async';
 
 abstract class PlatformTarget {
   bool _initialized = false;
 
   factory PlatformTarget() => new _DefaultPlatform();
 
   PlatformTarget.base();
 
   bool get initialized => _initialized;
 
   void initialize() {
     assert(!_initialized);
     _initialized = true;
   }
 
   Future clearValues();
 
   Future setValue(String key, String value);
 
   Future<String> getValue(String key);
 
-  bool get renderBig;
+  int get size;
 
   bool get showAbout;
 
   void toggleAbout([bool value]);
 
   Stream get aboutChanged;
 }
 
 class _DefaultPlatform extends PlatformTarget {
   final Map<String, String> _values = new Map<String, String>();
   final StreamController _aboutController = new StreamController(sync: true);
   bool _about = false;
 
-  _DefaultPlatform(): super.base();
+  _DefaultPlatform() : super.base();
 
   @override
   Future clearValues() => new Future(_values.clear);
 
   @override
   Future setValue(String key, String value) =>
       new Future(() { _values[key] = value; });
 
   @override
   Future<String> getValue(String key) => new Future(() => _values[key]);
 
-  bool get renderBig => false;
+  int get size => 7;
 
   void toggleAbout([bool value]) {
     assert(_about != null);
     if (value == null) {
       value = !_about;
     }
     _about = value;
     _aboutController.add(null);
   }
 
   bool get showAbout => _about;
 
   Stream get aboutChanged => _aboutController.stream;
 }