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

content/common/navigation_params.h

Index: content/common/navigation_params.h
diff --git a/content/common/navigation_params.h b/content/common/navigation_params.h
index cb3048ce88874fa498679dfb495cc14c6302445b..de7913d0c9638b35070edac0cfa91ca34ef19ae3 100644
--- a/content/common/navigation_params.h
+++ b/content/common/navigation_params.h
@@ -26,18 +26,6 @@
 
 namespace content {
 
-// The LoFi state which determines whether to add the Lo-Fi header.
-enum LoFiState {
-  // Let the browser process decide whether or not to request the Lo-Fi version.
-  LOFI_UNSPECIFIED = 0,
-
-  // Request a normal (non-Lo-Fi) version of the resource.
-  LOFI_OFF,
-
-  // Request a Lo-Fi version of the resource.
-  LOFI_ON,
-};
-
 // PlzNavigate
 // Helper function to determine if the navigation to |url| should make a request
 // to the network stack. A request should not be sent for JavaScript URLs or
@@ -65,7 +53,7 @@ struct CONTENT_EXPORT CommonNavigationParams {
       FrameMsg_UILoadMetricsReportType::Value report_type,
       const GURL& base_url_for_data_url,
       const GURL& history_url_for_data_url,
-      LoFiState lofi_state,
+      int previews_state,
       const base::TimeTicks& navigation_start,
       std::string method,
       const scoped_refptr<ResourceRequestBodyImpl>& post_data);
@@ -116,9 +104,9 @@ struct CONTENT_EXPORT CommonNavigationParams {
   // Is only used with data: URLs.
   GURL history_url_for_data_url;
 
-  // Whether or not to request a LoFi version of the document or let the browser
-  // decide.
-  LoFiState lofi_state;
+  // Bitmask that has whether or not to request a Preview version of the
+  // document for various preview types or let the browser decide.
+  int previews_state;
 
   // The navigationStart time exposed through the Navigation Timing API to JS.
   // If this is for a browser-initiated navigation, this can override the