Calls ShortcutHelper::FinalizeLauncherIcon() on worker thread instead of on IO thread

chrome/browser/android/webapps/add_to_homescreen_dialog_helper.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_DIALOG_HELPER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_DIALOG_HELPER_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
@@ skipping 29 matching lines @@
   static bool RegisterAddToHomescreenDialogHelper(JNIEnv* env);
 
   // Adds a shortcut to the current URL to the Android home screen.
   void AddShortcut(JNIEnv* env,
                    const base::android::JavaParamRef<jobject>& obj,
                    const base::android::JavaParamRef<jstring>& title);
 
   // AddToHomescreenDataFetcher::Observer
   void OnUserTitleAvailable(const base::string16& user_title) override;
   void OnDataAvailable(const ShortcutInfo& info, const SkBitmap& icon) override;
-  SkBitmap FinalizeLauncherIcon(const SkBitmap& icon,
-                                const GURL& url,
-                                bool* is_generated) override;
+  SkBitmap FinalizeLauncherIconInBackground(const SkBitmap& icon,
+                                            const GURL& url,
+                                            bool* is_generated) override;
 
  private:
   virtual ~AddToHomescreenDialogHelper();
 
   // Called only when the AddToHomescreenDataFetcher has retrieved all of the
   // data needed to add the shortcut.
   void AddShortcut(const ShortcutInfo& info, const SkBitmap& icon);
 
   void RecordAddToHomescreen();
 
   // Points to the Java object.
   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
 
   // Whether the user has requested that a shortcut be added while a fetch was
   // in progress.
   bool add_shortcut_pending_;
 
   // Fetches data required to add a shortcut.
   scoped_refptr<AddToHomescreenDataFetcher> data_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenDialogHelper);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_DIALOG_HELPER_H_