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 546457dc95fc2f9750387d86f4dd426664364afd..08ffef7a38a25b5f4f7ed9a72a5d563286f6f254 100644
--- a/components/previews/core/previews_experiments.cc
+++ b/components/previews/core/previews_experiments.cc
@@ -4,8 +4,6 @@
 
 #include "components/previews/core/previews_experiments.h"
 
-#include <string>
-
 #include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
@@ -139,7 +137,7 @@ base::TimeDelta OfflinePreviewFreshnessDuration() {
                          "offline_preview_freshness_duration_in_days", 7));
 }
 
-net::EffectiveConnectionType EffectiveConnectionTypeThresholdForOffline() {
+net::EffectiveConnectionType DefaultEffectiveConnectionTypeThreshold() {
   return GetParamValueAsECT(kClientSidePreviewsFieldTrial,
                             kEffectiveConnectionTypeThreshold,
                             net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
@@ -176,4 +174,20 @@ net::EffectiveConnectionType EffectiveConnectionTypeThresholdForClientLoFi() {
 
 }  // namespace params
 
+std::string GetStringNameForType(PreviewsType type) {
+  switch (type) {
+    case PreviewsType::OFFLINE:
+      return "Offline";
+    case PreviewsType::LOFI:
+      return "LoFi";
+    case PreviewsType::LITE_PAGE:
+      return "LitePage";
+    case PreviewsType::NONE:
+    case PreviewsType::LAST:
+      break;
+  }
+  NOTREACHED();
+  return std::string();
+}
+
 }  // namespace previews