Idea for AddToHomescreenDataFetcher tests

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/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/task/cancelable_task_tracker.h"
@@ skipping 75 matching lines @@
 
   // Accessors, etc.
   void set_weak_observer(Observer* observer) { weak_observer_ = observer; }
   bool is_ready() const { return is_ready_; }
   const SkBitmap& badge_icon() const { return badge_icon_; }
   const SkBitmap& primary_icon() const { return primary_icon_; }
   ShortcutInfo& shortcut_info() { return shortcut_info_; }
 
  private:
   friend class base::RefCounted<AddToHomescreenDataFetcher>;
+  friend class AddToHomescreenDataFetcherTest;
 
   ~AddToHomescreenDataFetcher() override;
 
   // WebContentsObserver:
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // Called if either InstallableManager or the favicon fetch takes too long.
   void OnDataTimedout();
 
   // Called when InstallableManager finishes looking for a manifest and icon.
@@ skipping 39 matching lines @@
   bool check_webapk_compatibility_;
   bool is_waiting_for_web_application_info_;
   bool is_installable_check_complete_;
   bool is_icon_saved_;
   bool is_ready_;
 
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenDataFetcher);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_DATA_FETCHER_H_