device/bluetooth: Implement BluetoothGattConnection on Chrome OS.

device/bluetooth/test/mock_bluetooth_gatt_connection.cc

+// Copyright 2014 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.
+
+#include "device/bluetooth/test/mock_bluetooth_gatt_connection.h"
+
+using ::testing::Return;
+
+namespace device {
+
+MockBluetoothGattConnection::MockBluetoothGattConnection(
+    const std::string& device_address) {
+  ON_CALL(*this, GetDeviceAddress()).WillByDefault(Return(device_address));
+  ON_CALL(*this, IsConnected()).WillByDefault(Return(true));
+}
+
+MockBluetoothGattConnection::~MockBluetoothGattConnection() {}
+
+}  // namespace device