bluetooth: Add Device connection logic and accompanying user interface.

device/bluetooth/public/interfaces/adapter.mojom

 // 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.
 
 module bluetooth.mojom;
 
 import "device/bluetooth/public/interfaces/device.mojom";
 
+enum ConnectErrorCode {
+  SUCCESS,
+  ATTRIBUTE_LENGTH_INVALID,
+  AUTH_CANCELED,
+  AUTH_FAILED,
+  AUTH_REJECTED,
+  AUTH_TIMEOUT,
+  CONNECTION_CONGESTED,
+  FAILED,
+  INPROGRESS,
+  INSUFFICIENT_ENCRYPTION,
+  OFFSET_INVALID,
+  READ_NOT_PERMITTED,
+  REQUEST_NOT_SUPPORTED,
+  UNKNOWN,
+  UNSUPPORTED_DEVICE,
+  WRITE_NOT_PERMITTED,
+  DEVICE_NO_LONGER_IN_RANGE,
+  UNTRANSLATED_CONNECT_ERROR_CODE
+};
+
 struct AdapterInfo {
   string address;
   string name;
   bool initialized;
   bool present;
   bool powered;
   bool discoverable;
   bool discovering;
 };
 
 interface Adapter {
   // Gets basic information about the adapter.
   GetInfo() => (AdapterInfo info);
 
-  // Gets the Device service for the device at the given address.
-  GetDevice(string address) => (Device? device);
+  // Creates a GATT connection to the device with |address| and returns a
+  // Device if the connection was succesful. The GATT connection is tied to the
+  // the lifetime of the Device message pipe.
+  ConnectToDevice(string address) => (ConnectErrorCode error, Device? device);
 
   // Retrieves the list of the devices known by the adapter including Connected
   // Devices, GATT Connected Devices, Paired Devices and Devices discovered
   // during a classic or low-energy scan.
   GetDevices() => (array<DeviceInfo> devices);
 
   // Sets the client that listens for the adapter's events.
   SetClient(AdapterClient client);
 };
 
@@ skipping 11 matching lines @@
   // Generally called for each advertisement packet recevied, but this is not
   // guaranteed on ChromeOS or Linux. Because the RSSI is always changing,
   // it's very likely this will be called for each advertising packet.
   DeviceChanged(DeviceInfo device);
 };
 
 interface AdapterFactory {
   // Gets an Adapter interface. Returns null if Bluetooth is not supported.
   GetAdapter() => (Adapter? adapter);
 };