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

content/common/resource_request.h

Index: content/common/resource_request.h
diff --git a/content/common/resource_request.h b/content/common/resource_request.h
index 0f5651fadff17f0ce9650188809c70f0fa0950e0..0103844b979ca480d608af2276b4291c6c9b97a4 100644
--- a/content/common/resource_request.h
+++ b/content/common/resource_request.h
@@ -15,6 +15,7 @@
 #include "content/common/resource_request_body_impl.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "content/public/common/appcache_info.h"
+#include "content/public/common/previews_state.h"
 #include "content/public/common/request_context_frame_type.h"
 #include "content/public/common/request_context_type.h"
 #include "content/public/common/resource_type.h"
@@ -174,9 +175,9 @@ struct CONTENT_EXPORT ResourceRequest {
   // 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.
+  PreviewsState previews_state = PREVIEWS_UNSPECIFIED;
 
   // 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