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

sky/sdk/lib/framework/rendering/paragraph.dart

Index: sky/sdk/lib/framework/rendering/paragraph.dart
diff --git a/sky/sdk/lib/framework/rendering/paragraph.dart b/sky/sdk/lib/framework/rendering/paragraph.dart
index c0823a7b591e1456d9e54bf315baaaf46c38a6ed..7cb4889315fa3e57908f8e13f48e39c84b13b17d 100644
--- a/sky/sdk/lib/framework/rendering/paragraph.dart
+++ b/sky/sdk/lib/framework/rendering/paragraph.dart
@@ -95,7 +95,7 @@ class RenderParagraph extends RenderBox {
                                           _applyFloatingPointHack(root.height)));
   }
 
-  void paint(RenderObjectDisplayList canvas) {
+  void paint(sky.Canvas canvas) {
     // Ideally we could compute the min/max intrinsic width/height with a
     // non-destructive operation. However, currently, computing these values
     // will destroy state inside the layout root. If that happens, we need to