Determine whether to show "Add to Homescreen" dialog or WebAPK infobar

chrome/browser/android/webapps/add_to_homescreen_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_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_DATA_FETCHER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_DATA_FETCHER_H_
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 38 matching lines @@
     // Converts the icon into one that can be used on the Android Home screen.
     // |is_generated| is an out-param that indicates whether the icon was
     // generated by Chrome.
     virtual SkBitmap FinalizeLauncherIconInBackground(const SkBitmap& icon,
                                                       const GURL& url,
                                                       bool* is_generated) = 0;
 
     // Called when all the data needed to create a shortcut is available.
     virtual void OnDataAvailable(const ShortcutInfo& info,
                                  const SkBitmap& icon) = 0;
+
+    protected:
+     virtual ~Observer() {}
   };
 
   // Initialize the fetcher by requesting the information about the page from
   // the renderer process. The initialization is asynchronous and
   // OnDidGetWebApplicationInfo is expected to be called when finished.
   AddToHomescreenDataFetcher(content::WebContents* web_contents,
                              int ideal_icon_size_in_dp,
                              int minimum_icon_size_in_dp,
                              int ideal_splash_image_size_in_dp,
                              int minimum_splash_image_size_in_dp,
@@ skipping 55 matching lines @@
   const int ideal_splash_image_size_in_dp_;
   const int minimum_splash_image_size_in_dp_;
   bool is_waiting_for_web_application_info_;
   bool is_icon_saved_;
   bool is_ready_;
 
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenDataFetcher);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_DATA_FETCHER_H_