Add message and Help Center link to the chooser UI

chrome/browser/ui/website_settings/chooser_bubble_delegate.h

Index: chrome/browser/ui/website_settings/chooser_bubble_delegate.h
diff --git a/chrome/browser/ui/website_settings/chooser_bubble_delegate.h b/chrome/browser/ui/website_settings/chooser_bubble_delegate.h
index 1dd40744a8db323360e1e750e3be79bab6dbb210..6031f27fcad3e5409ccc63f05da26e655e810c42 100644
--- a/chrome/browser/ui/website_settings/chooser_bubble_delegate.h
+++ b/chrome/browser/ui/website_settings/chooser_bubble_delegate.h
@@ -52,6 +52,9 @@ class ChooserBubbleDelegate : public BubbleDelegate {
     virtual ~Observer() {}
   };
 
+  // Open help center URL.
+  void OpenHelpCenterUrl() const;
+
   // BubbleDelegate:
   std::string GetName() const override;
   scoped_ptr<BubbleUi> BuildBubbleUi() override;
@@ -77,6 +80,12 @@ class ChooserBubbleDelegate : public BubbleDelegate {
   // closes without the user taking an explicit action.
   virtual void Close() = 0;
 
+  // Get help center URL.
+  virtual base::string16 GetHelpCenterUrl() const = 0;
+
+  // Get the description string of the option.
+  virtual base::string16 GetOptionDescription() const = 0;
+
   // Only one observer may be registered at a time.
   void set_observer(Observer* observer) { observer_ = observer; }
   Observer* observer() const { return observer_; }