tree b564c8ac8c8a6b722da179223d299b79bd8c69ee
parent 36168805cae010e322c7d8e0aac8a057a8ace1ae
author Tao Zhou <taoalpha@google.com> 1565265503 +0200
committer Tao Zhou <taoalpha@google.com> 1565335606 +0200

Add undefined check for observers with multiple args

As in Polymer 2, observers will run at least one of the dependencies
is defined while Polymer 1 will wait for all dependencies to be
defined. This change will add an undefined check to wait until all
arguments are defined for obervers with more than one arguments.

Bug: Issue 10723
Change-Id: I372359b2f9eb6200f06f22c744c57e9d725d69ba