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

sky/examples/game/lib/node_with_size.dart

Index: sky/examples/game/lib/node_with_size.dart
diff --git a/sky/examples/game/lib/node_with_size.dart b/sky/examples/game/lib/node_with_size.dart
index b527619b8683aaf6eff75dafec561e6a9ffe1610..15503d26922b5394fb28884f3092de3c39d38f18 100644
--- a/sky/examples/game/lib/node_with_size.dart
+++ b/sky/examples/game/lib/node_with_size.dart
@@ -32,7 +32,7 @@ abstract class NodeWithSize extends Node {
   /// If you use this method you will need to save and restore your canvas at the beginning and
   /// end of your [paint] method.
   ///
-  ///     void paint(PictureRecorder canvas) {
+  ///     void paint(RenderCanvas canvas) {
   ///       canvas.save();
   ///       applyTransformForPivot(canvas);
   ///
@@ -40,7 +40,7 @@ abstract class NodeWithSize extends Node {
   ///
   ///       canvas.restore();
   ///     }
-  void applyTransformForPivot(PictureRecorder canvas) {
+  void applyTransformForPivot(RenderCanvas canvas) {
     if (pivot.x != 0 || pivot.y != 0) {
       double pivotInPointsX = size.width * pivot.x;
       double pivotInPointsY = size.height * pivot.y;