bluetooth: Add device list retrieval for chrome://bluetooth-internals

chrome/browser/resources/bluetooth_internals/bluetooth_internals.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Javascript for bluetooth_internals.html, served from
  *     chrome://bluetooth-internals/.
  */
 
-document.addEventListener('DOMContentLoaded', function() {
-  console.log('Welcome to Bluetooth Internals.');
-});
+/**
+ * The implementation of AdapterClient in
+ *     device/bluetooth/public/interfaces/adapter.mojom.
+ */
+class AdapterClient {
+  /**
+   * Prints added device to console.
+   * @param {!Object} device the device that was added
+   */
+  deviceAdded(device) {
+    console.log('Device added');
+    console.log(device);
+  }
+
+  /**
+   * Prints removed device to console.
+   * @param {!Object} device the device that was removed
+   */
+  deviceRemoved(device) {
+    console.log('Device removed');
+    console.log(device);
+  }
+};
+
+(function() {
+  let adapter = null;
+  let adapterClient = null;
+  let adapterClientHandle = null;
+
+  /**
+   * Helper to convert callback-based define() API to a promise-based API.
+   * @param {!Array<string>} moduleNames
+   * @return {!Promise}
+   */
+  function importModules(moduleNames) {
+    return new Promise(function(resolve, reject) {
+      define(moduleNames, function(var_args) {
+        resolve(Array.prototype.slice.call(arguments, 0));
+      });
+    });
+  }
+
+  /**
+   * Initializes Mojo proxies for page and Bluetooth services.
+   * @return {!Promise}
+   */
+  function initializeProxies() {
+    return importModules([
+             'content/public/renderer/frame_interfaces',
+             'device/bluetooth/public/interfaces/adapter.mojom',
+             'mojo/public/js/connection',
+           ])
+        .then(([frameInterfaces, bluetooth, connection]) => {

[scheib, 2016/09/28 03:12:21]

The 'bluetooth' returned module will be trouble later when we import multiple
mojom files all in the 'bluetooth' module - but they each only provide part of
that space.

A code search shows that seperate mojom files are the right path, it will just
be ugly JS binding code until that's cleaned up. 

Likely the 'bluetooth' variable here will need to become bluetoothAdapter, and
it's use below bluetoothAdapter.Adapter. ;P

[mbrunson, 2016/09/28 21:20:34]

Yeah. I realized this but left it the same because it's not an issue yet. I'll
go ahead and change it.

+          console.log('Loaded modules');
+
+          // Hook up the instance properties
+          Object.setPrototypeOf(
+              AdapterClient.prototype,
+              bluetooth.AdapterClient.stubClass.prototype);
+
+          adapterClient = new AdapterClient();

[ortuno, 2016/09/28 09:44:54]

nit: Move this next to where it's used.

[mbrunson, 2016/09/28 21:20:34]

Done.

+
+          // Create a message pipe and bind one end to client
+          // implementation
+          adapterClientHandle = connection.bindStubDerivedImpl(adapterClient);
+
+          adapter = connection.bindHandleToProxy(
+              frameInterfaces.getInterface(bluetooth.Adapter.name),
+              bluetooth.Adapter);
+
+          adapter.setClient(adapterClientHandle);
+        });
+  }
+
+  document.addEventListener('DOMContentLoaded', function() {
+    initializeProxies()
+        .then(() => adapter.getDevices())
+        .then(response => console.log(response.devices));
+  });
+})();