Add help link when Bluetooth adapter is off for WebBluetooth chooser

chrome/common/url_constants.cc

 // Copyright (c) 2012 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 "chrome/common/url_constants.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "build/build_config.h"
@@ skipping 764 matching lines @@
 const char kChooserBluetoothOverviewURL[] =
     "https://support.google.com/chrome?p=bluetooth";
 
 const char kChooserUsbOverviewURL[] =
     "https://support.google.com/chrome?p=webusb";
 
 #if defined(OS_CHROMEOS)
 const char kEolNotificationURL[] = "https://www.google.com/chromebook/older/";
 #endif
 
+const char kBluetoothAdapterOffHelpURL[] =
+#if defined(OS_CHROMEOS)
+    "chrome://settings/search#Bluetooth";
+#elif defined(OS_LINUX)
+    "https://help.ubuntu.com/stable/ubuntu-help/bluetooth-turn-on-off.html";
+#elif defined(OS_MACOSX)
+    "https://support.apple.com/kb/PH18971?locale=en_US";
+#elif defined(OS_WIN)
+    "https://support.microsoft.com/en-us/search?query=Bluetooth";
+#else
+    "";
+#endif
+
 }  // namespace chrome