Sync: Support nodes with implicit permanent folders: Node Browser and out-of-order loading from DB

sync/internal_api/write_node.cc

Index: sync/internal_api/write_node.cc
diff --git a/sync/internal_api/write_node.cc b/sync/internal_api/write_node.cc
index f3852b0f51b5cea1d40088ce3952843e4f476151..825e2eda0fd82f1b9200b396f0642fcce55ef00e 100644
--- a/sync/internal_api/write_node.cc
+++ b/sync/internal_api/write_node.cc
@@ -385,8 +385,8 @@ WriteNode::InitUniqueByCreationResult WriteNode::InitUniqueByCreationImpl(
   // We don't support directory and tag combinations.
   entry_->PutIsDir(false);
 
-  if (!parent_id.IsNull()) {
-    if (!PutPredecessor(NULL))
+  if (entry_->ShouldMaintainPosition()) {
+    if (!entry_->PutPredecessor(syncable::Id()))
       return INIT_FAILED_SET_PREDECESSOR;
   }