Adding an IO Data and keyed service to previews/

chrome/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 835 matching lines @@
     "prerender/prerender_message_filter.cc",
     "prerender/prerender_message_filter.h",
     "prerender/prerender_origin.cc",
     "prerender/prerender_origin.h",
     "prerender/prerender_resource_throttle.cc",
     "prerender/prerender_resource_throttle.h",
     "prerender/prerender_tab_helper.cc",
     "prerender/prerender_tab_helper.h",
     "prerender/prerender_util.cc",
     "prerender/prerender_util.h",
+    "previews/previews_service.cc",
+    "previews/previews_service.h",
+    "previews/previews_service_factory.cc",
+    "previews/previews_service_factory.h",
     "process_resource_usage.cc",
     "process_resource_usage.h",
     "process_singleton.h",
     "process_singleton_win.cc",
     "profiles/avatar_menu_actions.h",
     "profiles/bookmark_model_loaded_observer.cc",
     "profiles/bookmark_model_loaded_observer.h",
     "profiles/chrome_browser_main_extra_parts_profiles.cc",
     "profiles/chrome_browser_main_extra_parts_profiles.h",
     "profiles/chrome_version_service.cc",
@@ skipping 3380 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }