Makes PreviewsService IsPreviewsTypeEnabled aware of new CPAT Feature

chrome/browser/previews/previews_service.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 "chrome/browser/previews/previews_service.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/sequenced_task_runner.h"
 #include "base/task_scheduler/post_task.h"
 #include "chrome/common/chrome_constants.h"
+#include "components/data_reduction_proxy/core/common/data_reduction_proxy_features.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"
 #include "components/previews/core/previews_opt_out_store_sql.h"
 #include "components/previews/core/previews_ui_service.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace {
 
 // Returns true if previews can be shown for |type|.
 bool IsPreviewsTypeEnabled(previews::PreviewsType type) {
+  bool server_previews_enabled = base::FeatureList::IsEnabled(
+      data_reduction_proxy::features::kDataReductionProxyDecidesTransform);
   switch (type) {
     case previews::PreviewsType::OFFLINE:
       return previews::params::IsOfflinePreviewsEnabled();
     case previews::PreviewsType::LOFI:
-      return previews::params::IsClientLoFiEnabled() ||
+      return server_previews_enabled ||
+             previews::params::IsClientLoFiEnabled() ||
              data_reduction_proxy::params::IsLoFiOnViaFlags() ||
              data_reduction_proxy::params::IsIncludedInLoFiEnabledFieldTrial();
     case previews::PreviewsType::LITE_PAGE:
-      return (data_reduction_proxy::params::IsLoFiOnViaFlags() &&
+      return server_previews_enabled ||
+             (data_reduction_proxy::params::IsLoFiOnViaFlags() &&
               data_reduction_proxy::params::AreLitePagesEnabledViaFlags()) ||
              data_reduction_proxy::params::IsIncludedInLitePageFieldTrial();
     case previews::PreviewsType::NONE:
     case previews::PreviewsType::LAST:
       break;
   }
   NOTREACHED();
   return false;
 }
 
@@ skipping 52 matching lines @@
           {base::MayBlock(), base::TaskPriority::BACKGROUND});
 
   previews_ui_service_ = base::MakeUnique<previews::PreviewsUIService>(
       previews_io_data, io_task_runner,
       base::MakeUnique<previews::PreviewsOptOutStoreSQL>(
           io_task_runner, background_task_runner,
           profile_path.Append(chrome::kPreviewsOptOutDBFilename),
           GetEnabledPreviews()),
       base::Bind(&IsPreviewsTypeEnabled));
 }