[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/iron-validatable-behavior/demo/validatable-input.html

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@@ skipping 26 matching lines @@
       'input': '_onInput'
     },
 
     _onInput: function(event) {
       this.invalid = !this.validate(event.target.value);
     }
 
   });
 
 </script>