Reland "cc: Remove layers that are not drawn from tile manager."

cc/layers/picture_layer_impl.cc

Index: cc/layers/picture_layer_impl.cc
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc
index 8a4e30ee8aeed23cd721254522ffaaeb664b46f8..a63588c9f7322b162dcaca39adaab3cd5c877a74 100644
--- a/cc/layers/picture_layer_impl.cc
+++ b/cc/layers/picture_layer_impl.cc
@@ -358,10 +358,14 @@ void PictureLayerImpl::AppendQuads(QuadSink* quad_sink,
 }
 
 void PictureLayerImpl::DidUnregisterLayer() {
+  TRACE_EVENT0("cc", "PictureLayerImpl::DidUnregisterLayer");
+
   layer_needs_to_register_itself_ = true;
 }
 
 void PictureLayerImpl::UpdateTilePriorities() {
+  TRACE_EVENT0("cc", "PictureLayerImpl::UpdateTilePriorities");
+
   DCHECK(!needs_post_commit_initialization_);
   CHECK(should_update_tile_priorities_);