Separate out the raw (directly manipulating sky.view) examples from the rendering (using RenderObje…

sky/examples/rendering/touch_demo.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:math';
 import 'dart:sky';
 import 'package:sky/framework/app.dart';
 import 'package:sky/framework/rendering/box.dart';
 import 'package:sky/framework/rendering/object.dart';
 
@@ skipping 59 matching lines @@
       dot.paint(canvas);
     });
   }
 }
 
 AppView app;
 
 void main() {
   app = new AppView(new RenderTouchDemo());
 }