Update SkiaDisplayList to use the modified SkLiteDL

SkLiteDL is no longer refcounted or a subclass of SkDrawable.

Test: on device testing in SkiaGL mode
Change-Id: I9ad53d764a26ab382d80d54908325962f2075802
diff --git a/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp b/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
index 117395b..39f11b8 100644
--- a/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
+++ b/libs/hwui/pipeline/skia/RenderNodeDrawable.cpp
@@ -197,12 +197,12 @@
             if (needsLayer) {
                 canvas->saveLayer(bounds, &paint);
             }
-            canvas->drawDrawable(displayList->mDrawable.get());
+            displayList->draw(canvas);
             if (needsLayer) {
                 canvas->restore();
             }
         } else {
-            canvas->drawDrawable(displayList->mDrawable.get());
+            displayList->draw(canvas);
         }
     }
 }