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

content/browser/frame_host/navigation_request.h

Index: content/browser/frame_host/navigation_request.h
diff --git a/content/browser/frame_host/navigation_request.h b/content/browser/frame_host/navigation_request.h
index 2c96e127ee42c6309e963a60fd56d41e6afa578e..4463798358cd77622dec75732574c904c8949ebb 100644
--- a/content/browser/frame_host/navigation_request.h
+++ b/content/browser/frame_host/navigation_request.h
@@ -15,6 +15,7 @@
 #include "content/common/frame_message_enums.h"
 #include "content/common/navigation_params.h"
 #include "content/public/browser/navigation_throttle.h"
+#include "content/public/common/previews_state.h"
 
 namespace content {
 
@@ -76,7 +77,7 @@ class CONTENT_EXPORT NavigationRequest : public NavigationURLLoaderDelegate {
       const FrameNavigationEntry& frame_entry,
       const NavigationEntryImpl& entry,
       FrameMsg_Navigate_Type::Value navigation_type,
-      LoFiState lofi_state,
+      PreviewsState previews_state,
       bool is_same_document_history_load,
       bool is_history_navigation_in_new_child,
       const base::TimeTicks& navigation_start,