A proof of concept for annular sector layout.

sky/engine/core/painting/Path.idl

Index: sky/engine/core/painting/Path.idl
diff --git a/sky/engine/core/painting/Path.idl b/sky/engine/core/painting/Path.idl
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+[
+  Constructor(),
+  ImplementedAs=CanvasPath,
+] interface Path {
+    void moveTo(float x, float y);
+    void lineTo(float x, float y);
+    void arcTo(Rect rect, float startAngle, float sweepAngle, boolean forceMoveTo);
+    void close();
+};