[Mac] Wrap NSUserActivity begin/end so that it can be called from common files

content/test/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/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 1352 matching lines @@
     "../common/cross_site_document_classifier_unittest.cc",
     "../common/cursors/webcursor_unittest.cc",
     "../common/dom_storage/dom_storage_map_unittest.cc",
     "../common/feature_policy/feature_policy_unittest.cc",
     "../common/indexed_db/indexed_db_key_unittest.cc",
     "../common/input/event_with_latency_info_unittest.cc",
     "../common/input/gesture_event_stream_validator_unittest.cc",
     "../common/input/input_param_traits_unittest.cc",
     "../common/input/touch_event_stream_validator_unittest.cc",
     "../common/inter_process_time_ticks_converter_unittest.cc",
+    "../common/mac/app_nap_activity_unittest.mm",
     "../common/mac/attributed_string_coder_unittest.mm",
     "../common/mac/font_descriptor_unittest.mm",
     "../common/manifest_util_unittest.cc",
     "../common/media/media_devices_unittest.cc",
     "../common/navigation_params_unittest.cc",
     "../common/origin_trials/trial_token_unittest.cc",
     "../common/origin_trials/trial_token_validator_unittest.cc",
     "../common/origin_util_unittest.cc",
     "../common/page_state_serialization_unittest.cc",
     "../common/page_zoom_unittest.cc",
@@ skipping 486 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }