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

sky/examples/rendering/sector_layout.dart

Index: sky/examples/rendering/sector_layout.dart
diff --git a/sky/examples/rendering/sector_layout.dart b/sky/examples/rendering/sector_layout.dart
index 2b1d6a0c90af77ccd83b37c6f8a8a588c6d552e0..c7118d2e2eb2ee5f54cbd9063d14d971b3893f67 100644
--- a/sky/examples/rendering/sector_layout.dart
+++ b/sky/examples/rendering/sector_layout.dart
@@ -113,7 +113,7 @@ class RenderDecoratedSector extends RenderSector {
   }
 
   // origin must be set to the center of the circle
-  void paint(RenderObjectDisplayList canvas) {
+  void paint(sky.Canvas canvas) {
     assert(deltaRadius != null);
     assert(deltaTheta != null);
     assert(parentData is SectorParentData);
@@ -249,13 +249,13 @@ class RenderSectorRing extends RenderSectorWithChildren {
 
   // paint origin is 0,0 of our circle
   // each sector then knows how to paint itself at its location
-  void paint(RenderObjectDisplayList canvas) {
+  void paint(sky.Canvas canvas) {
     // TODO(ianh): avoid code duplication
     super.paint(canvas);
     RenderSector child = firstChild;
     while (child != null) {
       assert(child.parentData is SectorChildListParentData);
-      canvas.paintChild(child, Point.origin);
+      paintChild(canvas, child, Point.origin);
       child = child.parentData.nextSibling;
     }
   }
@@ -354,13 +354,13 @@ class RenderSectorSlice extends RenderSectorWithChildren {
 
   // paint origin is 0,0 of our circle
   // each sector then knows how to paint itself at its location
-  void paint(RenderObjectDisplayList canvas) {
+  void paint(sky.Canvas canvas) {
     // TODO(ianh): avoid code duplication
     super.paint(canvas);
     RenderSector child = firstChild;
     while (child != null) {
       assert(child.parentData is SectorChildListParentData);
-      canvas.paintChild(child, Point.origin);
+      paintChild(canvas, child, Point.origin);
       child = child.parentData.nextSibling;
     }
   }
@@ -428,11 +428,11 @@ class RenderBoxToRenderSectorAdapter extends RenderBox {
   }
 
   // paint origin is 0,0 of our circle
-  void paint(RenderObjectDisplayList canvas) {
+  void paint(sky.Canvas canvas) {
     super.paint(canvas);
     if (child != null) {
       Rect bounds = new Rect.fromSize(size);
-      canvas.paintChild(child, bounds.center);
+      paintChild(canvas, child, bounds.center);
     }
   }