Teach SkyView path to draw a circle

sky/engine/core/view/View.idl

Index: sky/engine/core/view/View.idl
diff --git a/sky/engine/core/painting/PaintingContext.idl b/sky/engine/core/view/View.idl
similarity index 70%
copy from sky/engine/core/painting/PaintingContext.idl
copy to sky/engine/core/view/View.idl
index 3f87cb8e80ecbdb38e3fb51f6b8c54c15281a276..abfe81f87fe91641967deeb6d473ac6ae2c078c8 100644
--- a/sky/engine/core/painting/PaintingContext.idl
+++ b/sky/engine/core/view/View.idl
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-interface PaintingContext : Canvas {
-  void commit();
+interface View {
+  attribute Picture picture;
+
+  void schedulePaint();
 };