Add message and Help Center link to the chooser UI

chrome/browser/ui/website_settings/chooser_bubble_delegate.cc

 // 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.
 
+#include "chrome/browser/net/referrer.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/website_settings/chooser_bubble_delegate.h"
 #include "content/public/browser/web_contents.h"
+#include "url/gurl.h"
 
 ChooserBubbleDelegate::ChooserBubbleDelegate(content::RenderFrameHost* owner)
     : browser_(chrome::FindBrowserWithWebContents(
           content::WebContents::FromRenderFrameHost(owner))),
       owning_frame_(owner) {}
 
 ChooserBubbleDelegate::~ChooserBubbleDelegate() {}
 
+void ChooserBubbleDelegate::OpenHelpCenterUrl() const {
+  browser_->OpenURL(content::OpenURLParams(
+      GURL(GetHelpCenterUrl()), content::Referrer(), NEW_FOREGROUND_TAB,
+      ui::PAGE_TRANSITION_AUTO_TOPLEVEL, false /* is_renderer_initiated */));
+}
+
 std::string ChooserBubbleDelegate::GetName() const {
   return "ChooserBubble";
 }
 
 const content::RenderFrameHost* ChooserBubbleDelegate::OwningFrame() const {
   return owning_frame_;
 }