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

chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h

Index: chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h
diff --git a/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h b/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h
index 3effb7b6b9a29f0c73c04b811a9d1e83ff2a7b0f..3b1de6ade2288029e0cb01e08a829f2dcc39325b 100644
--- a/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h
+++ b/chrome/browser/android/webapps/add_to_homescreen_dialog_helper.h
@@ -47,9 +47,9 @@ class AddToHomescreenDialogHelper :
   // 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();