Add message and Help Center link to the chooser UI

chrome/browser/ui/bluetooth/bluetooth_chooser_bubble_delegate.h

 // Copyright 2015 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 CHROME_BROWSER_UI_BLUETOOTH_BLUETOOTH_CHOOSER_BUBBLE_DELEGATE_H_
 #define CHROME_BROWSER_UI_BLUETOOTH_BLUETOOTH_CHOOSER_BUBBLE_DELEGATE_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 11 matching lines @@
  public:
   explicit BluetoothChooserBubbleDelegate(content::RenderFrameHost* owner);
   ~BluetoothChooserBubbleDelegate() override;
 
   // ChooserBubbleDelegate:
   size_t NumOptions() const override;
   const base::string16& GetOption(size_t index) const override;
   void Select(size_t index) override;
   void Cancel() override;
   void Close() override;
+  GURL GetHelpCenterUrl() const override;
 
   // Shows a new device in the chooser.
   void AddDevice(const std::string& device_id,
                  const base::string16& device_name);
 
   // Tells the chooser that a device is no longer available.
   void RemoveDevice(const std::string& device_id);
 
   void set_bluetooth_chooser(BluetoothChooserDesktop* bluetooth_chooser) {
     bluetooth_chooser_ = bluetooth_chooser;
   }
 
   void set_bubble_controller(BubbleReference bubble_controller) {
     bubble_controller_ = bubble_controller;
   }
 
  private:
   // Each pair is a (device name, device id).
   std::vector<std::pair<base::string16, std::string>> device_names_and_ids_;
   BluetoothChooserDesktop* bluetooth_chooser_;
   BubbleReference bubble_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothChooserBubbleDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_BLUETOOTH_BLUETOOTH_CHOOSER_BUBBLE_DELEGATE_H_