Add skeletons for the factories to create the request coordinator and

chrome/browser/android/offline_pages/prerendering_offliner.cc

 // Copyright 2016 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/offline_pages/prerendering_offliner.h"
 
 namespace offline_pages {
 
-PrerenderingOffliner::PrerenderingOffliner(PrerenderManager* prerender_manager,
+PrerenderingOffliner::PrerenderingOffliner(const OfflinerPolicy* policy,
+                                           PrerenderManager* prerender_manager,
                                            OfflinePageModel* offline_page_model)
     : loader_(new PrerenderingLoader(prerender_manager)) {}
 
 PrerenderingOffliner::~PrerenderingOffliner() {}
 
 bool PrerenderingOffliner::LoadAndSave(const SavePageRequest& request,
                                        const CompletionCallback& callback) {
   // TODO(dougarnett): implement.
   return false;
 }
 
 void PrerenderingOffliner::Cancel() {
   loader_->StopLoading();
 }
 
 }  // namespace offline_pages