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

chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
index d4204d7ed729d9b20ac3a5b4bc5749c1110507b6..7745c58602d81c83730216d5f5aafcba7f0eff80 100644
--- a/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
@@ -66,6 +66,7 @@
 #include "content/public/browser/service_worker_context.h"
 #include "content/public/browser/stream_info.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/previews_state.h"
 #include "content/public/common/resource_response.h"
 #include "extensions/features/features.h"
 #include "net/base/load_flags.h"
@@ -828,16 +829,19 @@ void ChromeResourceDispatcherHostDelegate::RequestComplete(
                  base::TimeTicks::Now() - url_request->creation_time()));
 }
 
-bool ChromeResourceDispatcherHostDelegate::ShouldEnableLoFiMode(
+int ChromeResourceDispatcherHostDelegate::GetPreviewsState(
     const net::URLRequest& url_request,
     content::ResourceContext* resource_context) {
   ProfileIOData* io_data = ProfileIOData::FromResourceContext(resource_context);
   data_reduction_proxy::DataReductionProxyIOData* data_reduction_proxy_io_data =
       io_data->data_reduction_proxy_io_data();
 
-  if (data_reduction_proxy_io_data)
-    return data_reduction_proxy_io_data->ShouldEnableLoFiMode(url_request);
-  return false;
+  if (data_reduction_proxy_io_data) {
+    return data_reduction_proxy_io_data->ShouldEnableLoFiMode(url_request)
+               ? content::SERVER_LOFI_ON
+               : content::PREVIEWS_OFF;
+  }
+  return content::PREVIEWS_OFF;
 }
 
 // static