[MD settings] updating polymer to 1.1.13

third_party/polymer/v1_0/components-chromium/iron-checked-element-behavior/iron-checked-element-behavior-extracted.js

+/**
+   * Use `Polymer.IronCheckedElementBehavior` to implement a custom element
+   * that has a `checked` property, which can be used for validation if the
+   * element is also `required`. Element instances implementing this behavior
+   * will also be registered for use in an `iron-form` element.
+   *
+   * @demo demo/index.html
+   * @polymerBehavior Polymer.IronCheckedElementBehavior
+   */
+  Polymer.IronCheckedElementBehavior = {
+
+    properties: {
+      /**
+       * Fired when the checked state changes.
+       *
+       * @event iron-change
+       */
+
+      /**
+       * Gets or sets the state, `true` is checked and `false` is unchecked.
+       */
+      checked: {
+        type: Boolean,
+        value: false,
+        reflectToAttribute: true,
+        notify: true,
+        observer: '_checkedChanged'
+      },
+
+      /**
+       * If true, the button toggles the active state with each tap or press
+       * of the spacebar.
+       */
+      toggles: {
+        type: Boolean,
+        value: true,
+        reflectToAttribute: true
+      },
+
+      /* Overriden from Polymer.IronFormElementBehavior */
+      value: {
+        type: String,
+        value: ''
+      }
+    },
+
+    observers: [
+      '_requiredChanged(required)'
+    ],
+
+    /**
+     * Returns false if the element is required and not checked, and true otherwise.
+     * @return {boolean} true if `required` is false, or if `required` and `checked` are both true.
+     */
+    _getValidity: function(_value) {
+      return this.disabled || !this.required || (this.required && this.checked);
+    },
+
+    /**
+     * Update the aria-required label when `required` is changed.
+     */
+    _requiredChanged: function() {
+      if (this.required) {
+        this.setAttribute('aria-required', 'true');
+      } else {
+        this.removeAttribute('aria-required');
+      }
+    },
+
+    /**
+     * Update the element's value when checked.
+     */
+    _checkedChanged: function() {
+      this.active = this.checked;
+      // Unless the user has specified a value, a checked element has the
+      // default value "on" when checked.
+      if (this.value === '')
+        this.value = this.checked ? 'on' : '';
+      this.fire('iron-change');
+    }
+  };
+
+  /** @polymerBehavior Polymer.IronCheckedElementBehavior */
+  Polymer.IronCheckedElementBehavior = [
+    Polymer.IronFormElementBehavior,
+    Polymer.IronValidatableBehavior,
+    Polymer.IronCheckedElementBehavior
+  ];