Change Lo-Fi bool to bitmask to support multiple Previews types

content/browser/loader/resource_loader.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 "content/browser/loader/resource_loader.h"
 
 #include <utility>
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ skipping 49 matching lines @@
   net::HttpResponseInfo response_info = request->response_info();
   response->head.was_fetched_via_spdy = response_info.was_fetched_via_spdy;
   response->head.was_alpn_negotiated = response_info.was_alpn_negotiated;
   response->head.alpn_negotiated_protocol =
       response_info.alpn_negotiated_protocol;
   response->head.connection_info = response_info.connection_info;
   response->head.socket_address = response_info.socket_address;
   const content::ResourceRequestInfo* request_info =
       content::ResourceRequestInfo::ForRequest(request);
   if (request_info)
-    response->head.is_using_lofi = request_info->IsUsingLoFi();
+    response->head.previews_state = request_info->GetPreviewsState();
 
   response->head.effective_connection_type =
       net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN;
 
   if (info->GetResourceType() == RESOURCE_TYPE_MAIN_FRAME) {
     DCHECK(info->IsMainFrame());
     net::NetworkQualityEstimator* estimator =
         request->context()->network_quality_estimator();
     if (estimator) {
       response->head.effective_connection_type =
@@ skipping 656 matching lines @@
       UMA_HISTOGRAM_ENUMERATION("Net.Prefetch.Pattern", prefetch_status,
                                 STATUS_MAX);
     }
   } else if (request_->response_info().unused_since_prefetch) {
     TimeDelta total_time = base::TimeTicks::Now() - request_->creation_time();
     UMA_HISTOGRAM_TIMES("Net.Prefetch.TimeSpentOnPrefetchHit", total_time);
   }
 }
 
 }  // namespace content