Add timestamp to infobar for stale Previews

chrome/browser/previews/previews_infobar_tab_helper.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/previews/previews_infobar_tab_helper.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "chrome/browser/loader/chrome_navigation_data.h"
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
@@ skipping 87 matching lines @@
     if (navigation_handle->IsErrorPage()) {
       // TODO(ryansturm): Add UMA for errors.
       return;
     }
     data_reduction_proxy::DataReductionProxySettings*
         data_reduction_proxy_settings =
             DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
                 web_contents()->GetBrowserContext());
     PreviewsInfoBarDelegate::Create(
         web_contents(), previews::PreviewsType::OFFLINE,
+        base::Time() /* previews_freshness */,
         data_reduction_proxy_settings &&
             data_reduction_proxy_settings->IsDataReductionProxyEnabled(),
         base::Bind(&AddPreviewNavigationCallback, browser_context_,
                    navigation_handle->GetRedirectChain()[0],
                    previews::PreviewsType::OFFLINE));
     // Don't try to show other infobars if this is an offline preview.
     return;
   }
 #endif  // defined(OS_ANDROID)
 
   const net::HttpResponseHeaders* headers =
       navigation_handle->GetResponseHeaders();
   if (headers && data_reduction_proxy::IsLitePagePreview(*headers)) {
+    base::Time previews_freshness;
+    headers->GetDateValue(&previews_freshness);
     PreviewsInfoBarDelegate::Create(
-        web_contents(), previews::PreviewsType::LITE_PAGE,
+        web_contents(), previews::PreviewsType::LITE_PAGE, previews_freshness,
         true /* is_data_saver_user */,
         base::Bind(&AddPreviewNavigationCallback, browser_context_,
                    navigation_handle->GetRedirectChain()[0],
                    previews::PreviewsType::LITE_PAGE));
   }
 }
 
 void PreviewsInfoBarTabHelper::ClearLastNavigationAsync() const {
   if (!committed_data_saver_navigation_id_)
     return;
   auto* data_reduction_proxy_settings =
       DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
           browser_context_);
   if (!data_reduction_proxy_settings ||
       !data_reduction_proxy_settings->data_reduction_proxy_service()) {
     return;
   }
   data_reduction_proxy_settings->data_reduction_proxy_service()
       ->pingback_client()
       ->ClearNavigationKeyAsync(committed_data_saver_navigation_id_.value());
 }