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/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"
 
 namespace previews {
 
 namespace {
 
@@ skipping 102 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 EffectiveConnectionTypeThreshold() {
   return GetParamValueAsECT(kClientSidePreviewsFieldTrial,
                             kEffectiveConnectionTypeThreshold,
                             net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
 }
 
 bool IsOfflinePreviewsEnabled() {
   //  Check if "show_offline_pages" is set to "true".
   return IsIncludedInClientSidePreviewsExperimentsFieldTrial() &&
          base::GetFieldTrialParamValue(kClientSidePreviewsFieldTrial,
                                        kOfflinePagesSlowNetwork) ==
              kExperimentEnabled;
 }
 
 int OfflinePreviewsVersion() {
   return GetParamValueAsInt(kClientSidePreviewsFieldTrial, kVersion, 0);
 }
 
 bool IsClientLoFiEnabled() {
   return base::StartsWith(
       base::FieldTrialList::FindFullName(kClientLoFiExperimentName), kEnabled,
       base::CompareCase::SENSITIVE);
 }
 
-int ClientLoFiVersion() {
+int LoFiVersion() {
   return GetParamValueAsInt(kClientLoFiExperimentName, kVersion, 0);
 }
 
-net::EffectiveConnectionType EffectiveConnectionTypeThresholdForClientLoFi() {
+net::EffectiveConnectionType EffectiveConnectionTypeThresholdForLoFi() {
   return GetParamValueAsECT(kClientLoFiExperimentName,
                             kEffectiveConnectionTypeThreshold,
                             net::EFFECTIVE_CONNECTION_TYPE_2G);
 }
 
 }  // namespace params
 
 bool IsIncludedInClientSidePreviewsExperimentsFieldTrial() {
   // By convention, an experiment in the client-side previews study enables use
   // of at least one client-side previews optimization if its name begins with
   // "Enabled."
   return base::StartsWith(
       base::FieldTrialList::FindFullName(kClientSidePreviewsFieldTrial),
       kEnabled, base::CompareCase::SENSITIVE);
 }
 
+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