bluetooth: Add Device connection logic and accompanying user interface.

chrome/browser/resources/bluetooth_internals/adapter_broker.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 AdapterBroker, served from
  *     chrome://bluetooth-internals/.
  */
 cr.define('adapter_broker', function() {
   /**
    * The proxy class of an adapter and router of adapter events.
    * Exposes an EventTarget interface that allows other object to subscribe to
    * to specific AdapterClient events.
    * Provides proxy access to Adapter functions. Converts parameters to Mojo
    * handles and back when necessary.
    * @constructor
    * @extends {cr.EventTarget}
    * @param {!interfaces.BluetoothAdapter.Adapter.proxyClass} adapter
    */
   var AdapterBroker = function(adapter) {
     this.adapter_ = adapter;
     this.adapterClient_ = new AdapterClient(this);
     this.setClient(this.adapterClient_);
   };
 
   AdapterBroker.prototype = {
     __proto__: cr.EventTarget.prototype,
 
     /**
+     * Creates a GATT connection to the device with |address|.
+     * @param {string} address
+     * @return {Promise<interfaces.BluetoothDevice.Device.proxyClass>}

[dpapad, 2016/11/10 19:05:02]

!Promise<!...>

[mbrunson, 2016/11/10 22:02:22]

Done.

+     */
+    connectToDevice: function(address) {
+      return this.adapter_.connectToDevice(address).then(function(response) {
+        if (response.result !=
+            interfaces.BluetoothAdapter.ConnectResult.SUCCESS) {
+          // TODO(crbug.com/663394): Replace with more descriptive error
+          // messages.
+          var errorString = Object.keys(

[dpapad, 2016/11/10 19:05:02]

Isn't this equivalent to 
interfaces.BluetoothAdapter.ConnectResult[response.result];

[mbrunson, 2016/11/10 22:02:22]

response.result is a number. ConnectResult is an object that represents an enum
which maps a string to a number.

This actually should be replaced by a for loop. Object.keys order is not
guaranteed but has been correct since I put this here.

+              interfaces.BluetoothAdapter.ConnectResult)[response.result];
+
+          throw new Error(errorString);
+        }
+
+        return interfaces.Connection.bindHandleToProxy(
+            response.device,
+            interfaces.BluetoothDevice.Device);
+      });
+    },
+
+    /**
      * Sets client of Adapter service.
      * @param {!interfaces.BluetoothAdapter.AdapterClient} adapterClient
      */
     setClient: function(adapterClient) {
       this.adapter_.setClient(interfaces.Connection.bindStubDerivedImpl(
           adapterClient));
     },
 
     /**
      * Gets an array of currently detectable devices from the Adapter service.
@@ skipping 98 matching lines @@
 
       adapterBroker = new AdapterBroker(adapter);
       return adapterBroker;
     });
   }
 
   return {
     getAdapterBroker: getAdapterBroker,
   };
 });