Update WebAPK if homescreen icon changed.

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/callback_forward.h"
@@ skipping 66 matching lines @@
   static int GetMinimumHomescreenIconSizeInDp();
 
   // Returns the ideal size for an image displayed on a web app's splash
   // screen.
   static int GetIdealSplashImageSizeInDp();
 
   // Returns the minimum size for an image displayed on a web app's splash
   // screen.
   static int GetMinimumSplashImageSizeInDp();
 
+  // Called when the homescreen image fetch initiated in FetchHomescreenImage()
+  // completes.
+  static void OnFetchedHomescreenImage(
+      const base::android::ScopedJavaGlobalRef<jobject> java_callback,
+      const SkBitmap& image);
+
   // Fetches the splash screen image and stores it inside the WebappDataStorage
   // of the webapp. The WebappDataStorage object *must* have been previously
   // created by |AddShortcutInBackgroundWithSkBitmap|; this method should be
   // passed as a closure to that method.
   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);
 
@@ skipping 19 matching lines @@
   static GURL GetScopeFromURL(const GURL& url);
 
  private:
   ShortcutHelper() = delete;
   ~ShortcutHelper() = delete;
 
   DISALLOW_COPY_AND_ASSIGN(ShortcutHelper);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_SHORTCUT_HELPER_H_