Add support to previews/ for Server LoFi and LitePages

components/previews/core/previews_experiments.cc

Index: components/previews/core/previews_experiments.cc
diff --git a/components/previews/core/previews_experiments.cc b/components/previews/core/previews_experiments.cc
index e8d738aa60a6b5fb0c735ab700faf301582065a2..9709c61bacbe0441a8703112c0e6312f11a99ebd 100644
--- a/components/previews/core/previews_experiments.cc
+++ b/components/previews/core/previews_experiments.cc
@@ -173,4 +173,22 @@ bool IsIncludedInClientSidePreviewsExperimentsFieldTrial() {
       kEnabled, base::CompareCase::SENSITIVE);
 }
 
+std::string GetStringNameForType(PreviewsType type) {
+  switch (type) {
+    case PreviewsType::OFFLINE:
+      return "Offline";
+    case PreviewsType::CLIENT_LOFI:
+      return "ClientLoFi";
+    case PreviewsType::SERVER_LOFI:
+      return "ServerLoFi";
+    case PreviewsType::LITE_PAGE:
+      return "LitePage";
+    case PreviewsType::NONE:
+    case PreviewsType::LAST:
+      break;
+  }
+  NOTREACHED();
+  return std::string();
+}
+
 }  // namespace previews