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

chrome/browser/android/shortcut_helper.h

 // Copyright 2013 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_SHORTCUT_HELPER_H_
 #define CHROME_BROWSER_ANDROID_SHORTCUT_HELPER_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
@@ skipping 30 matching lines @@
   // Returns the minimum size for an image displayed on a web app's splash
   // screen.
   static int GetMinimumSplashImageSizeInDp();
 
   // Fetches the splash screen image and stores it inside the WebappDataStorage
   // of the webapp.
   static void FetchSplashScreenImage(content::WebContents* web_contents,
                                      const GURL& image_url,
                                      const int ideal_splash_image_size_in_dp,
                                      const int minimum_splash_image_size_in_dp,
-                                     const std::string& webapp_id);
+                                     const std::string& webapp_id,
+                                     const std::string& webapp_scope);
 
   // Stores the data of the webapp which is not placed inside the shortcut.
   static void StoreWebappData(const std::string& webapp_id,
+                              const std::string& webapp_url,
                               const SkBitmap& splash_image);
 
   // Modify the given icon to matche the launcher requirements, then returns the
   // new icon. It might generate an entirely new icon, in which case,
   // |is_generated| will be set to |true|.
   static SkBitmap FinalizeLauncherIcon(const SkBitmap& icon,
                                        const GURL& url,
                                        bool* is_generated);
 
  private:
   ShortcutHelper() = delete;
   ~ShortcutHelper() = delete;
 
   DISALLOW_COPY_AND_ASSIGN(ShortcutHelper);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_SHORTCUT_HELPER_H_