Add support to previews/ for Server LoFi and LitePages

components/previews/core/previews_experiments.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/previews/core/previews_experiments.h"
 
-#include <string>
-
 #include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/field_trial_params.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "components/previews/core/previews_features.h"
 
 namespace previews {
 
@@ skipping 113 matching lines @@
       GetParamValueAsInt(kClientSidePreviewsFieldTrial,
                          "single_opt_out_duration_in_seconds", 60 * 5));
 }
 
 base::TimeDelta OfflinePreviewFreshnessDuration() {
   return base::TimeDelta::FromDays(
       GetParamValueAsInt(kClientSidePreviewsFieldTrial,
                          "offline_preview_freshness_duration_in_days", 7));
 }
 
-net::EffectiveConnectionType EffectiveConnectionTypeThresholdForOffline() {
+net::EffectiveConnectionType DefaultEffectiveConnectionTypeThreshold() {
   return GetParamValueAsECT(kClientSidePreviewsFieldTrial,
                             kEffectiveConnectionTypeThreshold,
                             net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
 }
 
 bool IsOfflinePreviewsEnabled() {
   //  Check if "show_offline_pages" is set to "true".
   return base::FeatureList::IsEnabled(features::kOfflinePreviews) ||
          (IsIncludedInClientSidePreviewsExperimentsFieldTrial() &&
           base::GetFieldTrialParamValue(kClientSidePreviewsFieldTrial,
@@ skipping 16 matching lines @@
 }
 
 net::EffectiveConnectionType EffectiveConnectionTypeThresholdForClientLoFi() {
   return GetParamValueAsECT(kClientLoFiExperimentName,
                             kEffectiveConnectionTypeThreshold,
                             net::EFFECTIVE_CONNECTION_TYPE_2G);
 }
 
 }  // 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