Make rendering use PaintingNodes for increased efficiency.

sky/engine/core/painting/Drawable.h

 // 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_DRAWABLE_PICTURE_H_
-#define SKY_ENGINE_CORE_DRAWABLE_PICTURE_H_
+#ifndef SKY_ENGINE_CORE_PAINTING_DRAWABLE_H_
+#define SKY_ENGINE_CORE_PAINTING_DRAWABLE_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"
 #include "third_party/skia/include/core/SkDrawable.h"
 
 namespace blink {
 
 class Drawable : public RefCounted<Drawable>, public DartWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtr<Drawable> create(PassRefPtr<SkDrawable> skDrawable);
     ~Drawable() override;
 
     PassRefPtr<Picture> newPictureSnapshot();
     SkDrawable* toSkia() const { return m_drawable.get(); }
 
 private:
     explicit Drawable(PassRefPtr<SkDrawable> skDrawable);
     RefPtr<SkDrawable> m_drawable;
 };
 
 } // namespace blink
 
-#endif  // SKY_ENGINE_CORE_DRAWABLE_PICTURE_H_
+#endif  // SKY_ENGINE_CORE_PAINTING_DRAWABLE_H_