Add a simple inksplash example

sky/sdk/lib/framework/rendering/render_node.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 '../node.dart';
+import '../scheduler.dart' as scheduler;
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 class ParentData {
   void detach() {
     detachSiblings();
   }
   void detachSiblings() { } // workaround for lack of inter-class mixins in Dart
   void merge(ParentData other) {
     // override this in subclasses to merge in data from other into this
@@ skipping 150 matching lines @@
     int newAngle, // 0..3
     Duration time
   }) { }
 
 
   // PAINTING
 
   static bool debugDoingPaint = false;
   void markNeedsPaint() {
     assert(!debugDoingPaint);
-    // TODO(abarth): It's very redundant to call this for every node in the
-    // render tree during layout. We should instead compute a summary bit and
-    // call it once at the end of layout.
-    sky.view.scheduleFrame();
+    scheduler.ensureVisualUpdate();
   }
   void paint(RenderNodeDisplayList canvas) { }
 
 
   // HIT TESTING
 
   void handlePointer(sky.PointerEvent event) {
     // override this if you have a client, to hand it to the client
     // override this if you want to do anything with the pointer event
   }
@@ skipping 186 matching lines @@
     }
   }
 
   ChildType get firstChild => _firstChild;
   ChildType get lastChild => _lastChild;
   ChildType childAfter(ChildType child) {
     assert(child.parentData is ParentDataType);
     return child.parentData.nextSibling;
   }
 }