Split Size into Size and Offset.

sky/sdk/lib/rendering/object.dart

Index: sky/sdk/lib/rendering/object.dart
diff --git a/sky/sdk/lib/rendering/object.dart b/sky/sdk/lib/rendering/object.dart
index 39981e0a6b69d31f7f69468314774f54d56de17c..5811ee2c38ecece6dd35631502581e5f2e4ca74e 100644
--- a/sky/sdk/lib/rendering/object.dart
+++ b/sky/sdk/lib/rendering/object.dart
@@ -4,13 +4,13 @@
 
 import 'dart:math' as math;
 import 'dart:sky' as sky;
-import 'dart:sky' show Point, Size, Rect, Color, Paint, Path;
+import 'dart:sky' show Point, Offset, Size, Rect, Color, Paint, Path;
 
 import '../base/hit_test.dart';
 import '../base/node.dart';
 import '../base/scheduler.dart' as scheduler;
 
-export 'dart:sky' show Point, Size, Rect, Color, Paint, Path;
+export 'dart:sky' show Point, Offset, Size, Rect, Color, Paint, Path;
 export '../base/hit_test.dart' show HitTestTarget, HitTestEntry, HitTestResult;
 
 
@@ -27,7 +27,7 @@ class ParentData {
 }
 
 class RenderCanvas extends sky.Canvas {
-  RenderCanvas(sky.PictureRecorder recorder, double width, double height) : super(recorder, width, height);
+  RenderCanvas(sky.PictureRecorder recorder, Size bounds) : super(recorder, bounds);
 
   void paintChild(RenderObject child, Point position) {
     translate(position.x, position.y);