Revert "Remove old serializer" It caused a regression, crbug.com/510422

public/web/WebPageSerializer.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 79 matching lines @@
     // The parameter localDirectoryName is relative path of directory which
     // contain all saved auxiliary files included all sub frames and resources.
     BLINK_EXPORT static bool serialize(
         WebLocalFrame*,
         bool recursive,
         WebPageSerializerClient*,
         const WebVector<WebURL>& links,
         const WebVector<WebString>& localPaths,
         const WebString& localDirectoryName);
 
+    // Retrieve all the resource for the passed view, including the main frame
+    // and sub-frames. Returns true if all resources were retrieved
+    // successfully.
+    BLINK_EXPORT static bool retrieveAllResources(WebView*,
+                                                   const WebVector<WebCString>& supportedSchemes,
+                                                   WebVector<WebURL>* resources,
+                                                   WebVector<WebURL>* frames);
+
     // FIXME: The following are here for unit testing purposes. Consider
     // changing the unit tests instead.
 
     // Generate the META for charset declaration.
     BLINK_EXPORT static WebString generateMetaCharsetDeclaration(const WebString& charset);
     // Generate the MOTW declaration.
     BLINK_EXPORT static WebString generateMarkOfTheWebDeclaration(const WebURL&);
     // Generate the default base tag declaration.
     BLINK_EXPORT static WebString generateBaseTagDeclaration(const WebString& baseTarget);
 };
 
 } // namespace blink
 
 #endif