code: private List<Node> addComputedPropertiesReflectionCalls(final PolymerClassDefinition cls) {
      List<Node> propertySinkStatements = new ArrayList<>();
      for (MemberDefinition prop : cls.props) {
        if (prop.value.isObjectLit()) {
          Node computed = NodeUtil.getFirstPropMatchingKey(prop.value, "computed");
          if (computed != null && computed.isString()) {
            propertySinkStatements.addAll(
                replaceMethodStringWithReflectedCalls(cls.target, computed));
          }
        }
      }
      return propertySinkStatements;
    }
docs: For any property in the Polymer property configuration object with a `computed` key, parse the
  method call and path arguments and replace them with property reflection calls.
  
  <p>Returns a list of property sink statements to guard against dead code elimination since the
  compiler may not see these methods as being used.