Do not show "Add to Home Screen" info bar if WebAPK is installed

chrome/browser/banners/app_banner_data_fetcher.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_BANNERS_APP_BANNER_DATA_FETCHER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_DATA_FETCHER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 140 matching lines @@
   void OnDidGetManifest(const GURL& manifest_url,
                         const content::Manifest& manifest);
   void OnDidCheckHasServiceWorker(bool has_service_worker);
   void OnAppIconFetched(const SkBitmap& bitmap);
 
   // Called when it is determined that the webapp has fulfilled the initial
   // criteria of having a manifest and a service worker.
   void OnHasServiceWorker(content::WebContents* web_contents);
 
   // Returns whether the given web app has already been installed.
-  // Implemented on desktop platforms only.
   virtual bool IsWebAppInstalled(content::BrowserContext* browser_context,
                                  const GURL& start_url);
 
   // Record that the banner could be shown at this point, if the triggering
   // heuristic allowed.
   void RecordCouldShowBanner();
 
   // Creates a banner for the app using the given icon.
   virtual void ShowBanner(const GURL& icon_url,
                           const SkBitmap* icon,
@@ skipping 39 matching lines @@
       content::BrowserThread::UI>;
   friend class base::DeleteHelper<AppBannerDataFetcher>;
   friend class AppBannerDataFetcherUnitTest;
   friend class base::RefCounted<AppBannerDataFetcher>;
   DISALLOW_COPY_AND_ASSIGN(AppBannerDataFetcher);
 };
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_DATA_FETCHER_H_