[Print Preview] Re-add flags for register promos

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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/about_flags.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 1504 matching lines @@
     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableDeviceDiscoveryNotifications,
                               switches::kDisableDeviceDiscoveryNotifications)
   },
   {
     "disable-privet-local-printing",
     IDS_FLAGS_DISABLE_PRIVET_LOCAL_PRINTING_NAME,
     IDS_FLAGS_DISABLE_PRIVET_LOCAL_PRINTING_DESCRIPTION,
     kOsWin | kOsLinux | kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kDisablePrivetLocalPrinting)
   },
+  {
+    "enable-print-preview-register-promos",
+    IDS_FLAGS_ENABLE_PRINT_PREVIEW_REGISTER_PROMOS_NAME,
+    IDS_FLAGS_ENABLE_PRINT_PREVIEW_REGISTER_PROMOS_DESCRIPTION,
+    kOsWin | kOsLinux | kOsCrOS,
+    SINGLE_VALUE_TYPE(switches::kEnablePrintPreviewRegisterPromos)
+  },
 #endif  // ENABLE_MDNS
 #if defined(OS_WIN)
   {
     "enable-cloud-print-xps",
     IDS_FLAGS_ENABLE_CLOUD_PRINT_XPS_NAME,
     IDS_FLAGS_ENABLE_CLOUD_PRINT_XPS_DESCRIPTION,
     kOsWin,
     SINGLE_VALUE_TYPE(switches::kEnableCloudPrintXps)
   },
 #endif
@@ skipping 898 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags