Update all Angular libs (run update_all.sh).

third_party/pkg/angular/lib/utils.dart

 library angular.util;
 
 bool toBool(x) {
   if (x is bool) return x;
   if (x is num) return x != 0;
   return false;
 }
 
 typedef FnWith0Args();
 typedef FnWith1Args(a0);
@@ skipping 100 matching lines @@
   "switch",
   "this",
   "throw",
   "true",
   "try",
   "var",
   "void",
   "while",
   "with"
 ]);
+
+/// Returns true iff o is [double.NAN].
+/// In particular, returns false if o is null.
+bool isNaN(Object o) => o is num && o.isNaN;
+
+/// Returns true iff o1 == o2 or both are [double.NAN].
+bool eqOrNaN(Object o1, Object o2) => o1 == o2 || (isNaN(o1) && isNaN(o2));