add disabled state

Author: frankiefu

paper-radio-button.css

@@ -82,4 +82,17 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
 #radioLabel[hidden] {
   display: none;
-}
+}
+
+/* disabled state */
+:host([disabled]) {
+  pointer-events: none;
+}
+
+:host([disabled]) #offRadio {
+  border-color: #eaeaea !important;
+}
+
+:host([disabled]) #onRadio {
+  background-color: #eaeaea !important;
+}

paper-radio-button.html

@@ -107,7 +107,16 @@
        * @type boolean
        * @default false
        */
-      toggles: false
+      toggles: false,
+      
+      /**
+       * If true, the user cannot interact with this element.
+       *
+       * @attribute disabled
+       * @type boolean
+       * @default false
+       */
+      disabled: {value: false, reflect: true}
     },
 
     eventDelegates: {