Decouple Canvas from DisplayList and map Picture and PictureRecorder more directly to their Skia co…

sky/sdk/lib/framework/rendering/stack.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;

[Hixie, 2015/06/18 00:07:10]

If we don't subclass Canvas to have a paintChild() method (as I think we
should), then we should at least have object.dart reexport it so that we don't
have to import dart:sky everywhere.

[iansf, 2015/06/20 00:02:38]

Acknowledged.

 
 import 'box.dart';
 import 'object.dart';
 
 class StackParentData extends BoxParentData with ContainerParentDataMixin<RenderBox> {
   double top;
   double right;
   double bottom;
   double left;
 
@@ skipping 170 matching lines @@
       }
 
       child = parentData.nextSibling;
     }
   }
 
   void hitTestChildren(HitTestResult result, { Point position }) {
     defaultHitTestChildren(result, position: position);
   }
 
-  void paint(RenderObjectDisplayList canvas) {
+  void paint(sky.Canvas canvas) {
     defaultPaint(canvas);
   }
 }