bluetooth: Add Device connection logic and accompanying user interface.

chrome/browser/resources/bluetooth_internals/adapter_broker.js

Index: chrome/browser/resources/bluetooth_internals/adapter_broker.js
diff --git a/chrome/browser/resources/bluetooth_internals/adapter_broker.js b/chrome/browser/resources/bluetooth_internals/adapter_broker.js
index c17c89fe2a4806ce63a0155d4f5fba024ef10c33..6e3be48e13e60dbe8f80004357a8ca7ec545544b 100644
--- a/chrome/browser/resources/bluetooth_internals/adapter_broker.js
+++ b/chrome/browser/resources/bluetooth_internals/adapter_broker.js
@@ -27,6 +27,22 @@ cr.define('adapter_broker', function() {
     __proto__: cr.EventTarget.prototype,
 
     /**
+     * Creates a GATT connection to the device with |address|.
+     * @param {string} address
+     * @return {Promise<interfaces.BluetoothDevice.Device.proxyClass>}
+     */
+    connectToDevice: function(address) {
+      return this.adapter_.connectToDevice(address).then(function(response) {
+        if (response.device) {
+          response.device = interfaces.Connection.bindHandleToProxy(
+              response.device,
+              interfaces.BluetoothDevice.Device);
+        }
+        return response;
+      });
+    },
+
+    /**
      * Sets client of Adapter service.
      * @param {interfaces.BluetoothAdapter.AdapterClient} adapterClient
      */