Default parentId for bookmarks.create()

chrome/common/extensions/api/bookmarks.json

 [
   {
     "namespace": "bookmarks",
     "types": [
       {
         "id": "BookmarkTreeNode",
         "type": "object",
         "description": "A node (either a bookmark or a folder) in the bookmark tree.  Child nodes are ordered within their parent folder.",
         "properties": {
           "id": {"type": "string", "minimum": 0, "description": "The unique identifier for the node. IDs are unique within the current profile, and they remain valid even after the browser is restarted."},
@@ skipping 115 matching lines @@
       },
       {
         "name": "create",
         "type": "function",
         "description": "Creates a bookmark or folder under the specified parentId.  If url is NULL or missing, it will be a folder.",
         "parameters": [
           {
             "type": "object",
             "name": "bookmark",
             "properties": {
-              "parentId": {"type": "string"},
+              "parentId": {
+                "type": "string",
+                "optional": true,
+                "description": "Defaults to the Other Bookmarks folder."},
               "index": {"type": "integer", "minimum": 0, "optional": true},
               "title": {"type": "string", "optional": true},
               "url": {"type": "string", "optional": true}
             }
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "parameters": [
@@ skipping 173 matching lines @@
       },
       {
         "name": "onImportEnded",
         "type": "function",
         "description": "Fired when a bookmark import session is ended.",
         "parameters": []
       }
     ]
   }
 ]