Add Settings bluetooth page test

chrome/browser/resources/settings/bluetooth_page/bluetooth_page.js

Index: chrome/browser/resources/settings/bluetooth_page/bluetooth_page.js
diff --git a/chrome/browser/resources/settings/bluetooth_page/bluetooth_page.js b/chrome/browser/resources/settings/bluetooth_page/bluetooth_page.js
index 6ba77e0252bf4139979e707f05c3c7fac017d46a..9a11f17784a622890f35d397056db0ea2a6f83d4 100644
--- a/chrome/browser/resources/settings/bluetooth_page/bluetooth_page.js
+++ b/chrome/browser/resources/settings/bluetooth_page/bluetooth_page.js
@@ -17,6 +17,21 @@
  * @group Chrome Settings Elements
  * @element settings-bluetooth-page
  */
+
+var bluetoothPage = bluetoothPage || {

[michaelpg, 2015/12/17 22:07:16]

use cr.define?

[stevenjb, 2015/12/17 22:13:57]

Hm, interesting question. I'm a bit reluctant to "pollute" the cr namespace with
test specific objects. I'd be curious to see what Dan has to say, but if you're
pretty certain that would be preferable I can change this now, otherwise we can
re-visit it later.

[Dan Beam, 2015/12/28 21:55:15]

cr.exportPath('bluetoothPage'); seems to do something like this

i wasn't sure if this was just an object or a namespace.  the distinction is
hazy in JS.  I'm fine with either way but define() or exportPath() have mild
benefits as we can change all the behaviors of these at once (from both the
runtime and compiler pass's perspectives).

+  /**
+   * Set this to provide a fake implementation for testing.
+   * @type {Bluetooth}
+   */
+  bluetoothApiForTest: null,
+
+  /**
+   * Set this to provide a fake implementation for testing.
+   * @type {BluetoothPrivate}
+   */
+  bluetoothPrivateApiForTest: null,
+};
+
 Polymer({
   is: 'settings-bluetooth-page',
 
@@ -83,6 +98,13 @@ Polymer({
    */
   bluetoothDeviceRemovedListener_: undefined,
 
+  /** @override */
+  ready: function() {
+    if (bluetoothPage.bluetoothApiForTest)
+      this.bluetooth = bluetoothPage.bluetoothApiForTest;
+    if (bluetoothPage.bluetoothPrivateApiForTest)
+      this.bluetoothPrivate = bluetoothPage.bluetoothPrivateApiForTest;
+  },
 
   /** @override */
   attached: function() {
@@ -231,11 +253,13 @@ Polymer({
   },
 
   /**
-   * @param {!Array<!chrome.bluetooth.Device>} deviceList
+   * @param {Object} deviceListChanges
    * @return {boolean} True if deviceList is not empty.
    * @private
    */
-  haveDevices_: function(deviceList) { return !!deviceList.length; },
+  haveDevices_: function(deviceListChanges) {
+    return !!this.deviceList.length;
+  },
 
   /**
    * @param {number} selectedDevice