Add support to previews/ for Server LoFi and LitePages

chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc

 // Copyright (c) 2012 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/loader/chrome_resource_dispatcher_host_delegate.h"
 
 #include <stdint.h>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 880 matching lines @@
   content::PreviewsState previews_state = content::PREVIEWS_UNSPECIFIED;
 
   if (data_reduction_proxy_io_data) {
     if (data_reduction_proxy_io_data->ShouldEnableLoFi(url_request))
       previews_state |= content::SERVER_LOFI_ON;
     if (data_reduction_proxy_io_data->ShouldEnableLitePages(url_request))
       previews_state |= content::SERVER_LITE_PAGE_ON;
 
     previews::PreviewsIOData* previews_io_data = io_data->previews_io_data();
     if (data_reduction_proxy_io_data->IsEnabled() && previews_io_data &&
+        previews::params::IsClientLoFiEnabled() &&
         previews_io_data->ShouldAllowPreview(
-            url_request, previews::PreviewsType::CLIENT_LOFI)) {
+            url_request, previews::PreviewsType::LOFI,
+            previews::params::EffectiveConnectionTypeThresholdForLoFi())) {
       previews_state |= content::CLIENT_LOFI_ON;
     }
   }
 
   if (previews_state == content::PREVIEWS_UNSPECIFIED)
     return content::PREVIEWS_OFF;
   return previews_state;
 }
 
 // static
@@ skipping 41 matching lines @@
             &ChromeResourceDispatcherHostDelegate::OnAbortedFrameLoad,
             base::Unretained(this), url, request_loading_time));
     return;
   }
 
   std::string metric_name = (request_loading_time.InMilliseconds() < 100 ?
       "Net.ErrAborted.Fast" : "Net.ErrAborted.Slow");
   rappor::SampleDomainAndRegistryFromGURL(
       g_browser_process->rappor_service(), metric_name, url);
 }