Implement a method to access the non-composited content root layer picture pile.

cc/picture_layer_impl.cc

Index: cc/picture_layer_impl.cc
diff --git a/cc/picture_layer_impl.cc b/cc/picture_layer_impl.cc
index e4c113a5aac5e9ce34d91998d77664cbe8e5b43d..5a6f111d7a30cc560fc687a68027d4f00f363e5e 100644
--- a/cc/picture_layer_impl.cc
+++ b/cc/picture_layer_impl.cc
@@ -192,6 +192,10 @@ void PictureLayerImpl::calculateContentsScale(
       gfx::ScaleSize(bounds(), max_contents_scale, max_contents_scale));
 }
 
+skia::RefPtr<SkPicture> PictureLayerImpl::getPicture() {
+  return pile_->GetFlattenedPicture();
+}
+
 scoped_refptr<Tile> PictureLayerImpl::CreateTile(PictureLayerTiling* tiling,
                                                  gfx::Rect rect) {
   TileManager* tile_manager = layerTreeImpl()->tile_manager();