bluetooth: Add Device connection logic and accompanying user interface.

device/bluetooth/adapter.h

 // 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.
 
 #ifndef DEVICE_BLUETOOTH_ADAPTER_H_
 #define DEVICE_BLUETOOTH_ADAPTER_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "device/bluetooth/bluetooth_adapter.h"
+#include "device/bluetooth/bluetooth_gatt_connection.h"
 #include "device/bluetooth/public/interfaces/adapter.mojom.h"
 #include "device/bluetooth/public/interfaces/device.mojom.h"
 
 namespace bluetooth {
 
 // Implementation of Mojo Adapter located in
 // device/bluetooth/public/interfaces/adapter.mojom.
 // It handles requests for Bluetooth adapter capabilities
 // and devices and uses the platform abstraction of device/bluetooth.
 class Adapter : public mojom::Adapter,
                 public device::BluetoothAdapter::Observer {
  public:
   explicit Adapter(scoped_refptr<device::BluetoothAdapter> adapter);
   ~Adapter() override;
 
   // mojom::Adapter overrides:
   void GetInfo(const GetInfoCallback& callback) override;
-  void GetDevice(const std::string& address,
-                 const GetDeviceCallback& callback) override;
+  void ConnectToDevice(const std::string& address,
+                       const ConnectToDeviceCallback& callback) override;
   void GetDevices(const GetDevicesCallback& callback) override;
   void SetClient(mojom::AdapterClientPtr client) override;
 
   // device::BluetoothAdapter::Observer overrides:
   void DeviceAdded(device::BluetoothAdapter* adapter,
                    device::BluetoothDevice* device) override;
   void DeviceRemoved(device::BluetoothAdapter* adapter,
                      device::BluetoothDevice* device) override;
   void DeviceChanged(device::BluetoothAdapter* adapter,
                      device::BluetoothDevice* device) override;
 
  private:
+  void OnGattConnected(
+      const ConnectToDeviceCallback& callback,
+      std::unique_ptr<device::BluetoothGattConnection> connection);
+
+  void OnConnectError(const ConnectToDeviceCallback& callback,
+                      device::BluetoothDevice::ConnectErrorCode error_code);
+
   // The current Bluetooth adapter.
   scoped_refptr<device::BluetoothAdapter> adapter_;
 
   // The adapter client that listens to this service.
   mojom::AdapterClientPtr client_;
 
   base::WeakPtrFactory<Adapter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Adapter);
 };
 
 }  // namespace bluetooth
 
 #endif  // DEVICE_BLUETOOTH_ADAPTER_H_