[Android Webapps] Make AddToHomescreenDataFetcher easier to test

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 <utility>
+
 #include "base/macros.h"
-#include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/android/shortcut_info.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace favicon_base {
 struct FaviconRawBitmapResult;
 }
 
-class GURL;
 class InstallableManager;
 struct InstallableData;
 struct WebApplicationInfo;
 
 // Aysnchronously fetches and processes data needed to create a shortcut for an
 // Android Home screen launcher.
-//
-// Because of the various asynchronous calls made by this class, it is
-// refcounted to prevent the class from being prematurely deleted.  If the
-// |weak_observer_| pointer becomes invalid, the pipeline should kill itself.
-class AddToHomescreenDataFetcher
-    : public base::RefCounted<AddToHomescreenDataFetcher>,
-      public content::WebContentsObserver {
+class AddToHomescreenDataFetcher : public content::WebContentsObserver {
  public:
   class Observer {
    public:
     // Called when the installable check is complete.
     virtual void OnDidDetermineWebApkCompatibility(
         bool is_webapk_compatible) = 0;
 
     // Called when the title of the page is available. Will be called after
     // OnDidDetermineWebApkCompatibility.
     virtual void OnUserTitleAvailable(const base::string16& title) = 0;
 
-    // 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& primary_icon,
                                  const SkBitmap& badge_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.

[dominickn, 2017/07/03 00:43:16]

Nit: document that |observer| must outlive this object.

   AddToHomescreenDataFetcher(content::WebContents* web_contents,
                              int ideal_icon_size_in_px,
                              int minimum_icon_size_in_px,
                              int ideal_splash_image_size_in_px,
                              int minimum_splash_image_size_in_px,
                              int badge_size_in_px,
                              int data_timeout_ms,
                              bool check_webapk_compatible,
                              Observer* observer);
 
+  ~AddToHomescreenDataFetcher() override;
+
   // IPC message received when the initialization is finished.
   void OnDidGetWebApplicationInfo(const WebApplicationInfo& web_app_info);
 
   // Accessors, etc.
-  void set_weak_observer(Observer* observer) { weak_observer_ = observer; }
   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>;
-
-  ~AddToHomescreenDataFetcher() override;
-
   // WebContentsObserver:
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* sender) override;
 
   // Called if either InstallableManager or the favicon fetch takes too long.
   void OnDataTimedout();
 
   // Called when InstallableManager finishes looking for a manifest and icon.
   void OnDidGetManifestAndIcons(const InstallableData& data);
 
   // Called when InstallableManager finishes checking for installability.
   void OnDidPerformInstallableCheck(const InstallableData& data);
 
   // Grabs the favicon for the current URL.
   void FetchFavicon();
   void OnFaviconFetched(
       const favicon_base::FaviconRawBitmapResult& bitmap_result);
 
-  // Creates the launcher icon from the given bitmap. shortcut_info_.url is
-  // used to generate an icon if there is no bitmap in |bitmap_result| or the
-  // bitmap is not large enough.
-  SkBitmap CreateLauncherIconFromFaviconInBackground(
-      const favicon_base::FaviconRawBitmapResult& bitmap_result);
-
   // Creates the primary launcher icon from the given |icon|.
   void CreateLauncherIcon(const SkBitmap& icon);
-  SkBitmap CreateLauncherIconInBackground(const SkBitmap& icon);
 
   // Notifies the observer that the shortcut data is all available.
-  void NotifyObserver(const SkBitmap& icon);
+  void NotifyObserver(const std::pair<SkBitmap, bool /*is_generated*/>& icon);
 
   InstallableManager* installable_manager_;
-  Observer* weak_observer_;
+  Observer* observer_;
 
   // The icons must only be set on the UI thread for thread safety.
   SkBitmap raw_primary_icon_;
   SkBitmap badge_icon_;
   SkBitmap primary_icon_;
   ShortcutInfo shortcut_info_;
 
   base::CancelableTaskTracker favicon_task_tracker_;
   base::OneShotTimer data_timeout_timer_;
 
   const int ideal_icon_size_in_px_;
   const int minimum_icon_size_in_px_;
   const int ideal_splash_image_size_in_px_;
   const int minimum_splash_image_size_in_px_;
   const int badge_size_in_px_;
   const int data_timeout_ms_;
 
   // Indicates whether to check WebAPK compatibility.
   bool check_webapk_compatibility_;
   bool is_waiting_for_web_application_info_;
-  bool is_installable_check_complete_;
+
+  base::WeakPtrFactory<AddToHomescreenDataFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenDataFetcher);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_DATA_FETCHER_H_