Add Bluetooth settings dialog tests

chrome/test/data/webui/settings/fake_bluetooth.js

Index: chrome/test/data/webui/settings/fake_bluetooth.js
diff --git a/chrome/test/data/webui/settings/fake_bluetooth.js b/chrome/test/data/webui/settings/fake_bluetooth.js
index 64e646eb1bea8884a0f28dee665b109faed7f9e1..06f5923a0ec188617a9832547db2218997e424bf 100644
--- a/chrome/test/data/webui/settings/fake_bluetooth.js
+++ b/chrome/test/data/webui/settings/fake_bluetooth.js
@@ -12,7 +12,13 @@ cr.define('settings', function() {
    * @implements {Bluetooth}
    */
   function FakeBluetooth() {
-    /** @type {boolean} */ this.enabled = false;
+    /** @type {!chrome.bluettoth.AdapterState} */ this.adapterState = {
+      address: '00:11:22:33:44:55:66',
+      name: 'Fake Adapter',
+      powered: false,
+      available: true,
+      discovering: false
+    };
 
     /** @type {!Array<!chrome.bluetooth.Device>} */ this.devices = [];
   }
@@ -20,6 +26,14 @@ cr.define('settings', function() {
   FakeBluetooth.prototype = {
     // Public testing methods.
     /**
+     * @param {boolean} enabled
+     */
+    setEnabled: function(enabled) {
+      this.adapterState.powered = enabled;
+      this.onAdapterStateChanged.callListeners(this.adapterState);
+    },
+
+    /**
      * @param {!Array<!chrome.bluetooth.Device>} devices
      */
     setDevicesForTest: function(devices) {
@@ -34,13 +48,7 @@ cr.define('settings', function() {
     /** @override */
     getAdapterState: function(callback) {
       setTimeout(function() {
-        callback({
-          address: '00:11:22:33:44:55:66',
-          name: 'Fake Adapter',
-          powered: this.enabled,
-          available: true,
-          discovering: false
-        });
+        callback(this.adapterState);
       }.bind(this));
     },