Instead of applying a transform for every RenderObject, pass down an Offset for where to paint.

sky/sdk/lib/widgets/ink_well.dart

Index: sky/sdk/lib/widgets/ink_well.dart
diff --git a/sky/sdk/lib/widgets/ink_well.dart b/sky/sdk/lib/widgets/ink_well.dart
index 0c13f5ce499790a026c27de20285b8124cb30e36..0e8a69058d8a67c2cb5aee837836db1d500ce7cf 100644
--- a/sky/sdk/lib/widgets/ink_well.dart
+++ b/sky/sdk/lib/widgets/ink_well.dart
@@ -88,15 +88,16 @@ class RenderInkWell extends RenderProxyBox {
     markNeedsPaint();
   }
 
-  void paint(RenderCanvas canvas) {
+  void paint(RenderCanvas canvas, Offset offset) {
     if (!_splashes.isEmpty) {
       canvas.save();
+      canvas.translate(offset.dx, offset.dy);
       canvas.clipRect(new Rect.fromSize(size));
       for (InkSplash splash in _splashes)
         splash.paint(canvas);
       canvas.restore();
     }
-    super.paint(canvas);
+    super.paint(canvas, offset);
   }
 }