Show the Data Saver string for offline previews when Data Saver is enabled

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_io_data.cc

 // Copyright 2015 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/net/spdyproxy/data_reduction_proxy_chrome_io_data.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 24 matching lines @@
 using data_reduction_proxy::DataReductionProxyParams;
 
 namespace {
 
 // If this is the first Lo-Fi response for a page load, a
 // PreviewsInfoBarDelegate is created, which handles showing Lo-Fi UI.
 void OnLoFiResponseReceivedOnUI(content::WebContents* web_contents) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   PreviewsInfoBarDelegate::Create(
       web_contents, PreviewsInfoBarDelegate::LOFI,
+      true /* is_data_saver_user */,
       PreviewsInfoBarDelegate::OnDismissPreviewsInfobarCallback());
 }
 
 } // namespace
 
 std::unique_ptr<data_reduction_proxy::DataReductionProxyIOData>
 CreateDataReductionProxyChromeIOData(
     net::NetLog* net_log,
     PrefService* prefs,
     const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
@@ skipping 27 matching lines @@
   data_reduction_proxy_io_data->set_lofi_decider(
       base::MakeUnique<data_reduction_proxy::ContentLoFiDecider>());
   data_reduction_proxy_io_data->set_lofi_ui_service(
       base::MakeUnique<data_reduction_proxy::ContentLoFiUIService>(
           ui_task_runner, base::Bind(&OnLoFiResponseReceivedOnUI)));
   data_reduction_proxy_io_data->set_data_usage_source_provider(
       base::MakeUnique<ChromeDataUseGroupProvider>());
 
   return data_reduction_proxy_io_data;
 }