Implement RenderImage and Image for Sky

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 {
@@ skipping 211 matching lines @@
   ChildType _child;
   ChildType get child => _child;
   void set child (ChildType value) {
     if (_child != null)
       dropChild(_child);
     _child = value;
     if (_child != null)
       adoptChild(_child);
     markNeedsLayout();
   }
+  void attachChildren() {
+    if (_child != null)
+      _child.attach();
+  }
+  void detachChildren() {
+    if (_child != null)
+      _child.detach();
+  }
 }
 
 
 // GENERIC MIXIN FOR RENDER NODES WITH A LIST OF CHILDREN
 
 abstract class ContainerParentDataMixin<ChildType extends RenderNode> {
   ChildType previousSibling;
   ChildType nextSibling;
   void detachSiblings() {
     if (previousSibling != null) {
@@ skipping 132 matching lines @@
     }
   }
 
   ChildType get firstChild => _firstChild;
   ChildType get lastChild => _lastChild;
   ChildType childAfter(ChildType child) {
     assert(child.parentData is ParentDataType);
     return child.parentData.nextSibling;
   }
 }