Create a Lite Page bit for previews and fallback to Lo-Fi

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 32a26c597bd0daf7ca4d9d52c11e6e9c9085a7fb..893828fc193c2b52f6216f75797e34c6eea70248 100644
--- a/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/loader/chrome_resource_dispatcher_host_delegate.cc
@@ -867,12 +867,18 @@ content::PreviewsState ChromeResourceDispatcherHostDelegate::GetPreviewsState(
   data_reduction_proxy::DataReductionProxyIOData* data_reduction_proxy_io_data =
       io_data->data_reduction_proxy_io_data();
 
+  content::PreviewsState previews_state = content::PREVIEWS_UNSPECIFIED;
+
   if (data_reduction_proxy_io_data) {
-    return data_reduction_proxy_io_data->ShouldEnableLoFiMode(url_request)
-               ? content::SERVER_LOFI_ON
-               : content::PREVIEWS_OFF;
+    if (data_reduction_proxy_io_data->ShouldEnableLoFi(url_request))
+      previews_state |= content::SERVER_LOFI_ON;
+    if (data_reduction_proxy_io_data->ShouldEnableLitePages(url_request))
+      previews_state |= content::SERVER_LITE_PAGE_ON;
   }
-  return content::PREVIEWS_OFF;
+
+  if (previews_state == content::PREVIEWS_UNSPECIFIED)
+    return content::PREVIEWS_OFF;
+  return previews_state;
 }
 
 // static