Improve syncing between dom distiller and the print preview request

chrome/browser/dom_distiller/lazy_dom_distiller_service.cc

 // Copyright 2014 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/dom_distiller/lazy_dom_distiller_service.h"
 
 #include <utility>
 
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/dom_distiller/dom_distiller_service_factory.h"
@@ skipping 68 matching lines @@
   return instance()->ViewEntry(delegate, std::move(distiller_page), entry_id);
 }
 
 scoped_ptr<ViewerHandle> LazyDomDistillerService::ViewUrl(
     ViewRequestDelegate* delegate,
     scoped_ptr<DistillerPage> distiller_page,
     const GURL& url) {
   return instance()->ViewUrl(delegate, std::move(distiller_page), url);
 }
 
+scoped_ptr<ViewerHandle> LazyDomDistillerService::AddViewRequestDelegate(
+    ViewRequestDelegate* delegate,
+    const GURL& url) {
+  return instance()->AddViewRequestDelegate(delegate, url);
+}
+
 scoped_ptr<DistillerPage>
 LazyDomDistillerService::CreateDefaultDistillerPage(
     const gfx::Size& render_view_size) {
   return instance()->CreateDefaultDistillerPage(render_view_size);
 }
 
 scoped_ptr<DistillerPage>
 LazyDomDistillerService::CreateDefaultDistillerPageWithHandle(
     scoped_ptr<SourcePageHandle> handle) {
   return instance()->CreateDefaultDistillerPageWithHandle(std::move(handle));
 }
 
 void LazyDomDistillerService::AddObserver(DomDistillerObserver* observer) {
   instance()->AddObserver(observer);
 }
 
 void LazyDomDistillerService::RemoveObserver(DomDistillerObserver* observer) {
   instance()->RemoveObserver(observer);
 }
 
 DistilledPagePrefs* LazyDomDistillerService::GetDistilledPagePrefs() {
   return instance()->GetDistilledPagePrefs();
 }
 
 }  // namespace dom_distiller