Add help link when Bluetooth adapter is off for WebBluetooth chooser

chrome/browser/chooser_controller/chooser_controller.h

Index: chrome/browser/chooser_controller/chooser_controller.h
diff --git a/chrome/browser/chooser_controller/chooser_controller.h b/chrome/browser/chooser_controller/chooser_controller.h
index 6e3f69a1a5ea9987a662f14e9f1c613a3042d324..df5f1ab42bb0605a80962beddd1202bcc569e318 100644
--- a/chrome/browser/chooser_controller/chooser_controller.h
+++ b/chrome/browser/chooser_controller/chooser_controller.h
@@ -96,6 +96,9 @@ class ChooserController {
   // Refresh the list of options.
   virtual void RefreshOptions() = 0;
 
+  // Provide help information when the adapter is off.
+  virtual void OpenAdapterOffHelpUrl() const;
+
   // Returns the status text to be shown in the chooser.
   virtual base::string16 GetStatus() const = 0;