Teach SkyView path to draw a circle

sky/engine/core/view/View.h

Index: sky/engine/core/view/View.h
diff --git a/sky/engine/core/view/View.h b/sky/engine/core/view/View.h
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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.
+
+#ifndef SKY_ENGINE_CORE_VIEW_VIEW_H_
+#define SKY_ENGINE_CORE_VIEW_VIEW_H_
+
+#include "base/callback.h"
+#include "sky/engine/core/painting/Picture.h"
+#include "sky/engine/tonic/dart_wrappable.h"
+#include "sky/engine/wtf/PassRefPtr.h"
+#include "sky/engine/wtf/RefCounted.h"
+
+namespace blink {
+
+class View : public RefCounted<View>, public DartWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    ~View() override;
+    static PassRefPtr<View> create(const base::Closure& schedulePaintCallback);
+
+    Picture* picture() const { return m_picture.get(); }
+    void setPicture(Picture* picture) { m_picture = picture; }
+
+    void schedulePaint();
+
+private:
+    explicit View(const base::Closure& schedulePaintCallback);
+
+    base::Closure m_schedulePaintCallback;
+    RefPtr<Picture> m_picture;
+};
+
+} // namespace blink
+
+#endif  // SKY_ENGINE_CORE_VIEW_VIEW_H_