Change all child.paint calls to canvas.paintChild and update the test results.

sky/sdk/lib/rendering/box.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' as math;
 import 'dart:sky' as sky;
 
 import 'package:vector_math/vector_math.dart';
 
 import '../base/debug.dart';
@@ skipping 471 matching lines @@
 
   void hitTestChildren(HitTestResult result, { Point position }) {
     if (child != null)
       child.hitTest(result, position: position);
     else
       super.hitTestChildren(result, position: position);
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null)
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
   }
 
 }
 
 class RenderConstrainedBox extends RenderProxyBox {
   RenderConstrainedBox({
     RenderBox child,
     BoxConstraints additionalConstraints
   }) : super(child), _additionalConstraints = additionalConstraints {
     assert(additionalConstraints != null);
@@ skipping 152 matching lines @@
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       int a = (_opacity * 255).round();
 
       if (a == 0)
         return;
 
       if (a == 255) {
-        child.paint(canvas, offset);
+        canvas.paintChild(child, offset.toPoint());
         return;
       }
 
       Paint paint = new Paint()
         ..color = new Color.fromARGB(a, 0, 0, 0)
         ..setTransferMode(sky.TransferMode.srcOver);
       canvas.saveLayer(null, paint);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 class RenderColorFilter extends RenderProxyBox {
   RenderColorFilter({ RenderBox child, Color color, sky.TransferMode transferMode })
     : _color = color, _transferMode = transferMode, super(child) {
   }
 
@@ skipping 15 matching lines @@
       return;
     _transferMode = value;
     markNeedsPaint();
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       Paint paint = new Paint()
         ..setColorFilter(new sky.ColorFilter.mode(_color, _transferMode));
       canvas.saveLayer(null, paint);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 class RenderClipRect extends RenderProxyBox {
   RenderClipRect({ RenderBox child }) : super(child);
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       canvas.save();
       canvas.clipRect(offset & size);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 class RenderClipRRect extends RenderProxyBox {
   RenderClipRRect({ RenderBox child, double xRadius, double yRadius })
     : _xRadius = xRadius, _yRadius = yRadius, super(child) {
     assert(_xRadius != null);
     assert(_yRadius != null);
@@ skipping 18 matching lines @@
     _yRadius = value;
     markNeedsPaint();
   }
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       Rect rect = offset & size;
       canvas.saveLayer(rect, new Paint());
       sky.RRect rrect = new sky.RRect()..setRectXY(rect, xRadius, yRadius);
       canvas.clipRRect(rrect);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 class RenderClipOval extends RenderProxyBox {
   RenderClipOval({ RenderBox child }) : super(child);
 
   void paint(PaintingCanvas canvas, Offset offset) {
     if (child != null) {
       Rect rect = offset & size;
       canvas.saveLayer(rect, new Paint());
       Path path = new Path();
       path.addOval(rect);
       canvas.clipPath(path);
-      child.paint(canvas, offset);
+      canvas.paintChild(child, offset.toPoint());
       canvas.restore();
     }
   }
 }
 
 abstract class RenderShiftedBox extends RenderBox with RenderObjectWithChildMixin<RenderBox> {
 
   // Abstract class for one-child-layout render boxes
 
   RenderShiftedBox(RenderBox child) {
@@ skipping 647 matching lines @@
 
   void defaultPaint(PaintingCanvas canvas, Offset offset) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position + offset);
       child = child.parentData.nextSibling;
     }
   }
 }