Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/iron-input/iron-input-extracted.js

+
+
+  Polymer({
+
+    is: 'iron-input',
+
+    extends: 'input',
+
+    properties: {
+
+      /**
+       * Use this property instead of `value` for two-way data binding.
+       */
+      bindValue: {
+        observer: '_bindValueChanged',
+        type: String
+      }
+
+    },
+
+    listeners: {
+      'input': '_onInput'
+    },
+
+    attached: function() {
+      this.bindValue = this.value;
+    },
+
+    _bindValueChanged: function() {
+      this.value = this.bindValue;
+      // manually notify because we don't want to notify until after setting value
+      this.fire('bind-value-changed', {value: this.bindValue});
+    },
+
+    _onInput: function(event) {
+      this.bindValue = event.target.value;
+    }
+
+  })