Store URLs in WebappDataStorage, and purge them when history is cleared.

chrome/browser/android/webapps/add_to_homescreen_data_fetcher.cc

 // 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.
 
 #include "chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h"
 
 #include "base/location.h"
 #include "base/strings/string16.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/android/offline_pages/offline_page_utils.h"
@@ skipping 152 matching lines @@
   DCHECK(!weak_observer_);
 }
 
 void AddToHomescreenDataFetcher::FetchSplashScreenImage(
     const std::string& webapp_id) {
   ShortcutHelper::FetchSplashScreenImage(
       web_contents(),
       splash_screen_url_,
       ideal_splash_image_size_in_dp_,
       minimum_splash_image_size_in_dp_,
-      webapp_id);
+      webapp_id,
+      shortcut_info_.url.spec());
 }
 
 void AddToHomescreenDataFetcher::FetchFavicon() {
   if (!web_contents() || !weak_observer_) return;
 
   Profile* profile =
       Profile::FromBrowserContext(web_contents()->GetBrowserContext());
 
   // Grab the best, largest icon we can find to represent this bookmark.
   // TODO(dfalcantara): Try combining with the new BookmarksHandler once its
@@ skipping 87 matching lines @@
       dom_distiller::url_utils::GetOriginalUrlFromDistillerUrl(actual_url);
 
   // If URL points to an offline content, get original URL.
   GURL online_url = offline_pages::OfflinePageUtils::GetOnlineURLForOfflineURL(
       web_contents()->GetBrowserContext(), original_url);
   if (online_url.is_valid())
     return online_url;
 
   return original_url;
 }