Implement experimental app banner flow.

chrome/browser/banners/app_banner_manager_desktop.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/banners/app_banner_manager_desktop.h"
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "build/build_config.h"
 #include "chrome/browser/banners/app_banner_infobar_delegate_desktop.h"
@@ skipping 40 matching lines @@
 }
 
 bool AppBannerManagerDesktop::IsWebAppInstalled(
     content::BrowserContext* browser_context,
     const GURL& start_url,
     const GURL& manifest_url) {
   return extensions::BookmarkAppHelper::BookmarkOrHostedAppInstalled(
       browser_context, start_url);
 }
 
-void AppBannerManagerDesktop::ShowBanner() {
+void AppBannerManagerDesktop::ShowBannerUI() {
   content::WebContents* contents = web_contents();
   DCHECK(contents && !manifest_.IsEmpty());
 
   Profile* profile = Profile::FromBrowserContext(contents->GetBrowserContext());
   WebApplicationInfo web_app_info;
 
   bookmark_app_helper_.reset(
       new extensions::BookmarkAppHelper(profile, web_app_info, contents));
 
   // This differs from Android, where there is a concrete
@@ skipping 29 matching lines @@
     double score) {
   // Explicitly forbid banners from triggering on navigation unless this is
   // enabled.
   if (!IsEnabled())
     return;
 
   AppBannerManager::OnEngagementIncreased(web_contents, url, score);
 }
 
 }  // namespace banners