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

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index 1edf89248c3f3955dbd7ba55128e9961ca15cbd9..10e49d6b5984aee1830fedb5ba74cf32ecce33d1 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -569,10 +569,10 @@ class CONTENT_EXPORT RenderFrameHostImpl
 
   void SetHasReceivedUserGesture();
 
-  // PlzNavigate: returns the LoFi state of the last successful navigation that
-  // made a network request.
-  LoFiState last_navigation_lofi_state() const {
-    return last_navigation_lofi_state_;
+  // PlzNavigate: returns the Previews state of the last successful navigation
+  // that made a network request.
+  int last_navigation_previews_state() const {
+    return last_navigation_previews_state_;
   }
 
  protected:
@@ -1044,10 +1044,10 @@ class CONTENT_EXPORT RenderFrameHostImpl
   // If true, then the RenderFrame has selected text.
   bool has_selection_;
 
-  // PlzNavigate: The LoFi state of the last navigation. This is used during
+  // PlzNavigate: The Previews state of the last navigation. This is used during
   // history navigation of subframes to ensure that subframes navigate with the
-  // same LoFi status as the top-level frame.
-  LoFiState last_navigation_lofi_state_;
+  // same Previews status as the top-level frame.
+  int last_navigation_previews_state_;
 
   mojo::Binding<mojom::FrameHost> frame_host_binding_;
   mojom::FramePtr frame_;