Sky should use an SkPicture when drawing

sky/compositor/layer_host.cc

Index: sky/compositor/layer_host.cc
diff --git a/sky/compositor/layer_host.cc b/sky/compositor/layer_host.cc
index d8ca387d14221320dee141676f9ec7cfabd25951..697ed265f06754973f5545d12c0daa613f1a7314 100644
--- a/sky/compositor/layer_host.cc
+++ b/sky/compositor/layer_host.cc
@@ -39,11 +39,6 @@ void LayerHost::SetNeedsAnimate() {
 void LayerHost::SetRootLayer(scoped_refptr<Layer> layer) {
   DCHECK(!root_layer_.get());
   root_layer_ = layer;
-  root_layer_->set_host(this);
-}
-
-void LayerHost::GetPixelsForTesting(std::vector<unsigned char>* pixels) {
-  return root_layer_->GetPixelsForTesting(pixels);
 }
 
 void LayerHost::OnSurfaceIdAvailable(mojo::SurfaceIdPtr surface_id) {