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

sky/engine/core/painting/Canvas.cpp

Index: sky/engine/core/painting/Canvas.cpp
diff --git a/sky/engine/core/painting/Canvas.cpp b/sky/engine/core/painting/Canvas.cpp
index 0e0bac9485372e17d4e95df09c190b9659cfd615..468e9bfc2f6479f0a18cbeb19d98a9771c07afd9 100644
--- a/sky/engine/core/painting/Canvas.cpp
+++ b/sky/engine/core/painting/Canvas.cpp
@@ -127,14 +127,6 @@ void Canvas::drawLine(const Point& p1, const Point& p2, const Paint* paint)
     m_canvas->drawLine(p1.sk_point.x(), p1.sk_point.y(), p2.sk_point.x(), p2.sk_point.y(), paint->paint());
 }
 
-void Canvas::drawPicture(Picture* picture)
-{
-    if (!m_canvas)
-        return;
-    ASSERT(picture);
-    m_canvas->drawPicture(picture->toSkia());
-}
-
 void Canvas::drawPaint(const Paint* paint)
 {
     if (!m_canvas)
@@ -199,4 +191,20 @@ void Canvas::drawImageRect(const CanvasImage* image, Rect& src, Rect& dst, Paint
     m_canvas->drawBitmapRectToRect(image->bitmap(), &src.sk_rect, dst.sk_rect, &paint->paint());
 }
 
+void Canvas::drawPicture(Picture* picture)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(picture);
+    m_canvas->drawPicture(picture->toSkia());
+}
+
+void Canvas::drawDrawable(Drawable* drawable)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(drawable);
+    m_canvas->drawDrawable(drawable->toSkia());
+}
+
 } // namespace blink