bluetooth: Add Device connection logic and accompanying user interface.

device/bluetooth/adapter.h

Index: device/bluetooth/adapter.h
diff --git a/device/bluetooth/adapter.h b/device/bluetooth/adapter.h
index f6a051fec252b6fb3e4a69cca02981cb2071c9b3..bea9621de77d0d90bbfa20eff0714e142e8aac14 100644
--- a/device/bluetooth/adapter.h
+++ b/device/bluetooth/adapter.h
@@ -5,11 +5,13 @@
 #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"
 
@@ -27,8 +29,8 @@ class Adapter : public mojom::Adapter,
 
   // 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;
 
@@ -41,6 +43,13 @@ class Adapter : public mojom::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_;