Implemented Asynchronous Initialization of BluetoothAdapter.

device/bluetooth/bluetooth_init_win.h

Index: device/bluetooth/bluetooth_init_win.h
diff --git a/device/bluetooth/bluetooth_init_win.h b/device/bluetooth/bluetooth_init_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..0bc89eaedc1f08b1e71307ed018d60fbd0d1ec30
--- /dev/null
+++ b/device/bluetooth/bluetooth_init_win.h
@@ -0,0 +1,31 @@
+// Copyright (c) 2013 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_BLUETOOTH_INIT_WIN_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_INIT_WIN_H_
+
+// windows.h needs to be included before BluetoothAPIs.h.
+#include <windows.h>
+
+#include <BluetoothAPIs.h>
+#if defined(_WIN32_WINNT_WIN8) && _MSC_VER < 1700
+// The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h.
+#undef FACILITY_VISUALCPP
+#endif
+#include <delayimp.h>
+
+#pragma comment(lib, "Bthprops.lib")
+
+namespace device {
+namespace bluetooth_init_win {
+
+// Returns true if the machine has a bluetooth stack available. The first call
+// to this function will involve file IO, so it should be done on an appropriate
+// thread. This function is not threadsafe.
+bool HasBluetoothStack();
+
+}  // namespace bluetooth_init_win
+}  // namespace device
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_INIT_WIN_H_