Add support to previews/ for Server LoFi and LitePages

chrome/browser/previews/previews_service.cc

Index: chrome/browser/previews/previews_service.cc
diff --git a/chrome/browser/previews/previews_service.cc b/chrome/browser/previews/previews_service.cc
index a0375e5f8833c32f8b2d615610ebdcf4e32b4689..002077f460d6c9773362dada7020849182ce7de1 100644
--- a/chrome/browser/previews/previews_service.cc
+++ b/chrome/browser/previews/previews_service.cc
@@ -10,6 +10,7 @@
 #include "base/sequenced_task_runner.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/common/chrome_constants.h"
+#include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
 #include "components/previews/core/previews_experiments.h"
 #include "components/previews/core/previews_io_data.h"
 #include "components/previews/core/previews_opt_out_store.h"
@@ -24,6 +25,14 @@ bool IsPreviewsTypeEnabled(previews::PreviewsType type) {
   switch (type) {
     case previews::PreviewsType::OFFLINE:
       return previews::params::IsOfflinePreviewsEnabled();
+    case previews::PreviewsType::SERVER_LOFI:
+      return data_reduction_proxy::params::IsLoFiOnViaFlags() ||
+             data_reduction_proxy::params::IsIncludedInLoFiEnabledFieldTrial();
+    case previews::PreviewsType::LITE_PAGE:
+      return (data_reduction_proxy::params::IsLoFiOnViaFlags() &&
+              data_reduction_proxy::params::AreLitePagesEnabledViaFlags()) ||
+             data_reduction_proxy::params::IsIncludedInLitePageFieldTrial();
+    // List remaining enum cases vs. default to catch when new one is added.
     case previews::PreviewsType::NONE:
     case previews::PreviewsType::LAST:
       break;
@@ -38,6 +47,11 @@ int GetPreviewsTypeVersion(previews::PreviewsType type) {
   switch (type) {
     case previews::PreviewsType::OFFLINE:
       return previews::params::OfflinePreviewsVersion();
+    case previews::PreviewsType::LITE_PAGE:
+      return data_reduction_proxy::params::LitePageVersion();
+    case previews::PreviewsType::SERVER_LOFI:
+      return data_reduction_proxy::params::LoFiVersion();
+    // List remaining enum cases vs. default to catch when new one is added.
     case previews::PreviewsType::NONE:
     case previews::PreviewsType::LAST:
       break;