Displaying "simplify page" on print preview by default

chrome/browser/dom_distiller/profile_utils.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/profile_utils.h"
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/dom_distiller/dom_distiller_service_factory.h"
 #include "chrome/browser/dom_distiller/lazy_dom_distiller_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_isolated_world_ids.h"
+#include "chrome/common/chrome_switches.h"
 #include "components/dom_distiller/content/browser/distiller_javascript_utils.h"
 #include "components/dom_distiller/content/browser/distiller_ui_handle.h"
 #include "components/dom_distiller/content/browser/dom_distiller_viewer_source.h"
 #include "components/dom_distiller/core/dom_distiller_switches.h"
 #include "components/dom_distiller/core/url_constants.h"
 
 #if defined(OS_ANDROID)
 #include "chrome/browser/android/dom_distiller/distiller_ui_handle_android.h"
 #endif  // defined(OS_ANDROID)
 
 void RegisterDomDistillerViewerSource(Profile* profile) {
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
-  if (command_line.HasSwitch(switches::kEnableDomDistiller)) {
+  if (command_line.HasSwitch(switches::kEnableDomDistiller) ||
+      !command_line.HasSwitch(switches::kDisablePrintPreviewSimplify)) {
     dom_distiller::DomDistillerServiceFactory* dom_distiller_service_factory =
         dom_distiller::DomDistillerServiceFactory::GetInstance();
     // The LazyDomDistillerService deletes itself when the profile is destroyed.
     dom_distiller::LazyDomDistillerService* lazy_service =
         new dom_distiller::LazyDomDistillerService(
             profile, dom_distiller_service_factory);
     scoped_ptr<dom_distiller::DistillerUIHandle> ui_handle;
 
 #if defined(OS_ANDROID)
     ui_handle.reset(
         new dom_distiller::android::DistillerUIHandleAndroid());
 #endif  // defined(OS_ANDROID)
 
     // Set the JavaScript world ID.
     if (!dom_distiller::DistillerJavaScriptWorldIdIsSet()) {
       dom_distiller::SetDistillerJavaScriptWorldId(
           chrome::ISOLATED_WORLD_ID_CHROME_INTERNAL);
     }
 
     content::URLDataSource::Add(
         profile,
         new dom_distiller::DomDistillerViewerSource(
             lazy_service, dom_distiller::kDomDistillerScheme,
             ui_handle.Pass()));
   }
 }