bluetooth: Add Device connection logic and accompanying user interface.

device/bluetooth/test/device_connection_helper.cc

Index: device/bluetooth/test/device_connection_helper.cc
diff --git a/device/bluetooth/test/device_connection_helper.cc b/device/bluetooth/test/device_connection_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fa7991057059b431d2ddddd46d7332cc70cd4a8b
--- /dev/null
+++ b/device/bluetooth/test/device_connection_helper.cc
@@ -0,0 +1,21 @@
+// 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.
+
+#include "device/bluetooth/test/device_connection_helper.h"
+
+namespace bluetooth {
+DeviceConnectionHelper::DeviceConnectionHelper(
+    mojo::Binding<mojom::Device>* binding)
+    : callback_ran_(false), binding_(binding) {}
+
+DeviceConnectionHelper::~DeviceConnectionHelper() {
+  if (!callback_ran_) {
+    DCHECK(!binding_->is_bound());
+  }
+}
+
+void DeviceConnectionHelper::SetCallbackRan(bool callback_ran) {
+  callback_ran_ = callback_ran;
+}
+}  // namespace bluetooth