Implemented Asynchronous Initialization of BluetoothAdapter.

device/bluetooth/bluetooth_init_win.cc

+// 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.
+
+#include "device/bluetooth/bluetooth_init_win.h"
+
+#include "base/threading/thread_restrictions.h"
+
+namespace {
+
+// A frame-based exception handler filter function for a handler for exceptions
+// generated by the Visual C++ delay loader helper function.
+int FilterVisualCPPExceptions(DWORD exception_code) {
+  return HRESULT_FACILITY(exception_code) == FACILITY_VISUALCPP ?
+      EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
+}
+
+}  // namespace
+
+namespace device {
+namespace bluetooth_init_win {
+
+bool HasBluetoothStack() {
+  static enum {
+    HBS_UNKNOWN,
+    HBS_YES,
+    HBS_NO,
+  } has_bluetooth_stack = HBS_UNKNOWN;
+
+  if (has_bluetooth_stack == HBS_UNKNOWN) {
+    base::ThreadRestrictions::AssertIOAllowed();
+    HRESULT hr = E_FAIL;
+    __try {
+      hr = __HrLoadAllImportsForDll("bthprops.cpl");
+    } __except(FilterVisualCPPExceptions(::GetExceptionCode())) {
+      hr = E_FAIL;
+    }
+    has_bluetooth_stack = SUCCEEDED(hr) ? HBS_YES : HBS_NO;
+  }
+
+  return has_bluetooth_stack == HBS_YES;
+}
+
+}  // namespace bluetooth_init_win
+}  // namespace device