Add APIs for dynamic display lists, using SkDrawable and SkPictureRecorder::endRecordingAsDrawable.

sky/engine/core/painting/Canvas.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_PAINTING_CANVAS_H_
 #define SKY_ENGINE_CORE_PAINTING_CANVAS_H_
 
 #include "sky/engine/bindings/exception_state.h"
 #include "sky/engine/core/painting/CanvasPath.h"
+#include "sky/engine/core/painting/Drawable.h"
 #include "sky/engine/core/painting/Offset.h"
 #include "sky/engine/core/painting/Paint.h"
 #include "sky/engine/core/painting/Picture.h"
 #include "sky/engine/core/painting/PictureRecorder.h"
 #include "sky/engine/core/painting/Point.h"
 #include "sky/engine/core/painting/RRect.h"
 #include "sky/engine/core/painting/Rect.h"
 #include "sky/engine/core/painting/Size.h"
 #include "sky/engine/platform/graphics/DisplayList.h"
 #include "sky/engine/tonic/dart_wrappable.h"
@@ skipping 45 matching lines @@
     void scale(float sx, float sy);
     void rotate(float radians);
     void skew(float sx, float sy);
     void concat(const Float32List& matrix4);
 
     void clipRect(const Rect& rect);
     void clipRRect(const RRect* rrect);
     void clipPath(const CanvasPath* path);
 
     void drawLine(const Point& p1, const Point& p2, const Paint* paint);
-    void drawPicture(Picture* picture);
     void drawPaint(const Paint* paint);
     void drawRect(const Rect& rect, const Paint* paint);
     void drawRRect(const RRect* rrect, const Paint* paint);
     void drawOval(const Rect& rect, const Paint* paint);
     void drawCircle(const Point& c, float radius, const Paint* paint);
     void drawPath(const CanvasPath* path, const Paint* paint);
     void drawImage(const CanvasImage* image, const Point& p, const Paint* paint);
     void drawImageRect(const CanvasImage* image, Rect& src, Rect& dst, Paint* paint);
+    void drawPicture(Picture* picture);
+    void drawDrawable(Drawable* drawable);
 
     SkCanvas* skCanvas() { return m_canvas; }
     void clearSkCanvas() { m_canvas = nullptr; }
     bool isRecording() const { return !!m_canvas; }
 
 protected:
     explicit Canvas(SkCanvas* skCanvas);
 
 private:
     // The SkCanvas is supplied by a call to SkPictureRecorder::beginRecording,
     // which does not transfer ownership.  For this reason, we hold a raw
     // pointer and manually set the SkCanvas to null in clearSkCanvas.
     SkCanvas* m_canvas;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_PAINTING_CANVAS_H_