Adding an IO Data and keyed service to previews/

components/previews/BUILD.gn

Index: components/previews/BUILD.gn
diff --git a/components/previews/BUILD.gn b/components/previews/BUILD.gn
index b5ca808c8113b8a79db5c49884c0e5914d4382ab..5e94ca2c68f68ab0df6af1b6d4939727a70909ed 100644
--- a/components/previews/BUILD.gn
+++ b/components/previews/BUILD.gn
@@ -1,29 +1,35 @@
 # 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.
 
 static_library("previews") {
   sources = [
     "previews_experiments.cc",
     "previews_experiments.h",
+    "previews_io_data.cc",
+    "previews_io_data.h",
+    "previews_ui_service.cc",
+    "previews_ui_service.h",
   ]
 
   deps = [
     "//base",
     "//components/variations",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "previews_experiments_unittest.cc",
+    "previews_io_data_unittest.cc",
+    "previews_ui_service_unittest.cc",
   ]
 
   deps = [
     ":previews",
     "//base",
     "//components/variations",
     "//testing/gtest",
   ]
 }