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..5d391bb4f4757406216585887f7e4861fdc83cbc 100644
--- a/content/common/resource_request.h
+++ b/content/common/resource_request.h
@@ -174,9 +174,9 @@ 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. 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