Add Canvas.drawPicture

sky/engine/core/painting/Canvas.h

Index: sky/engine/core/painting/Canvas.h
diff --git a/sky/engine/core/painting/Canvas.h b/sky/engine/core/painting/Canvas.h
index a316f6592f69a73db1d072cd06a769deaa9833f2..e22d04910c06c29d4134a8e876aaf5c308dfe2b3 100644
--- a/sky/engine/core/painting/Canvas.h
+++ b/sky/engine/core/painting/Canvas.h
@@ -6,6 +6,7 @@
 #define SKY_ENGINE_CORE_PAINTING_CANVAS_H_
 
 #include "sky/engine/core/painting/Paint.h"
+#include "sky/engine/core/painting/Picture.h"
 #include "sky/engine/platform/graphics/DisplayList.h"
 #include "sky/engine/tonic/dart_wrappable.h"
 #include "sky/engine/wtf/PassRefPtr.h"
@@ -37,6 +38,8 @@ public:
 
     void clipRect(const Vector<float>& rect);
 
+    void drawPicture(Picture* picture);
+
     void drawPaint(Paint* paint);
     void drawRect(const Vector<float>& rect, const Paint* paint);
     void drawOval(const Vector<float>& rect, const Paint* paint);