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/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/host_desktop.h"
+#include "chrome/browser/ui/scoped_tabbed_browser_displayer.h"
 #include "chrome/browser/ui/website_settings/chooser_bubble_delegate.h"
 #include "content/public/browser/web_contents.h"
 
+namespace {
+
+Browser* GetBrowser() {
+  chrome::ScopedTabbedBrowserDisplayer browser_displayer(
+      ProfileManager::GetActiveUserProfile());
+  DCHECK(browser_displayer.browser());
+  return browser_displayer.browser();
+}
+
+void OpenURL(const GURL& url) {
+  GetBrowser()->OpenURL(
+      content::OpenURLParams(url, content::Referrer(), NEW_BACKGROUND_TAB,
+                             ui::PAGE_TRANSITION_AUTO_TOPLEVEL, true));
+}
+
+}  // namespace
+
 ChooserBubbleDelegate::ChooserBubbleDelegate(content::RenderFrameHost* owner)
     : browser_(chrome::FindBrowserWithWebContents(
           content::WebContents::FromRenderFrameHost(owner))),
       owning_frame_(owner) {}
 
 ChooserBubbleDelegate::~ChooserBubbleDelegate() {}
 
+void ChooserBubbleDelegate::OpenHelpCenterURL() const {
+  OpenURL(GetHelpCenterURL());
+}
+
 std::string ChooserBubbleDelegate::GetName() const {
   return "ChooserBubble";
 }
 
 const content::RenderFrameHost* ChooserBubbleDelegate::OwningFrame() const {
   return owning_frame_;
 }