Make pull to refresh not perform regular reload (with cache revalidation)

content/browser/frame_host/navigation_controller_impl.cc

 // 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.
 
 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  *     (http://www.torchmobile.com/)
  *
@@ skipping 56 matching lines @@
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_constants.h"
+#include "content/public/common/content_switches.h"
 #include "media/base/mime_util.h"
 #include "net/base/escape.h"
 #include "net/base/net_util.h"
 #include "skia/ext/platform_canvas.h"
 #include "url/url_constants.h"
 
 namespace content {
 namespace {
 
 // Invoked when entries have been pruned, or removed. For example, if the
@@ skipping 196 matching lines @@
   // cleared out safely.
   entries->clear();
 
   // And finish the restore.
   FinishRestore(selected_navigation, type);
 }
 
 void NavigationControllerImpl::Reload(bool check_for_repost) {
   ReloadInternal(check_for_repost, RELOAD);
 }
+void NavigationControllerImpl::ReloadToRefreshContent(bool check_for_repost) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableNonValidatingReloadOnRefreshContent)) {
+    ReloadInternal(check_for_repost, NO_RELOAD);
+  } else {
+    ReloadInternal(check_for_repost, RELOAD);
+  }
+}
 void NavigationControllerImpl::ReloadIgnoringCache(bool check_for_repost) {
   ReloadInternal(check_for_repost, RELOAD_IGNORING_CACHE);
 }
 void NavigationControllerImpl::ReloadOriginalRequestURL(bool check_for_repost) {
   ReloadInternal(check_for_repost, RELOAD_ORIGINAL_REQUEST_URL);
 }
 void NavigationControllerImpl::ReloadDisableLoFi(bool check_for_repost) {
   ReloadInternal(check_for_repost, RELOAD_DISABLE_LOFI_MODE);
 }
 
@@ skipping 1729 matching lines @@
     }
   }
 }
 
 void NavigationControllerImpl::SetGetTimestampCallbackForTest(
     const base::Callback<base::Time()>& get_timestamp_callback) {
   get_timestamp_callback_ = get_timestamp_callback;
 }
 
 }  // namespace content