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

content/common/resource_request.h

 // 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.
 
 #ifndef CONTENT_COMMON_RESOURCE_REQUEST_H_
 #define CONTENT_COMMON_RESOURCE_REQUEST_H_
 
 #include <stdint.h>
 #include <string>
 
@@ skipping 156 matching lines @@
   // Unless this refers to a transferred navigation, these values are -1 and -1.
   int transferred_request_child_id = -1;
   int transferred_request_request_id = -1;
 
   // Whether or not we should allow the URL to download.
   bool allow_download = false;
 
   // Whether to intercept headers to pass back to the renderer.
   bool report_raw_headers = false;
 
-  // Whether or not to request a LoFi version of the resource or let the browser
-  // decide.
-  LoFiState lofi_state = LOFI_UNSPECIFIED;
+  // Whether or not to request a Preview version of the resource or let the
+  // browser decide. A value of zero indicates to let the browser decide.
+  int previews_state = 0;
 
   // PlzNavigate: the stream url associated with a navigation. Used to get
   // access to the body of the response that has already been fetched by the
   // browser.
   GURL resource_body_stream_url;
 
   // Wether or not the initiator of this request is a secure context.
   bool initiated_in_secure_context = false;
 
   // The response should be downloaded and stored in the network cache, but not
   // sent back to the renderer.
   bool download_to_network_cache_only = false;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_RESOURCE_REQUEST_H_