Move UserActivityDetector to ui/base/user_activity/.

ui/base/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/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 215 matching lines @@
     "ui_base_export.h",
     "ui_base_exports.cc",
     "ui_base_paths.cc",
     "ui_base_paths.h",
     "ui_base_switches.cc",
     "ui_base_switches.h",
     "ui_base_switches_util.cc",
     "ui_base_switches_util.h",
     "ui_base_types.cc",
     "ui_base_types.h",
+    "user_activity/user_activity_detector.cc",
+    "user_activity/user_activity_detector.h",
+    "user_activity/user_activity_observer.h",
     "view_prop.cc",
     "view_prop.h",
     "webui/jstemplate_builder.cc",
     "webui/jstemplate_builder.h",
     "webui/web_ui_util.cc",
     "webui/web_ui_util.h",
     "win/accessibility_ids_win.h",
     "win/accessibility_misc_utils.cc",
     "win/accessibility_misc_utils.h",
     "win/atl_module.h",
@@ skipping 488 matching lines @@
     "l10n/l10n_util_unittest.cc",
     "l10n/l10n_util_win_unittest.cc",
     "l10n/time_format_unittest.cc",
     "layout_unittest.cc",
     "models/tree_node_iterator_unittest.cc",
     "resource/data_pack_literal.cc",
     "resource/data_pack_unittest.cc",
     "resource/resource_bundle_unittest.cc",
     "test/test_clipboard_unittest.cc",
     "test/run_all_unittests.cc",
+    "user_activity/user_activity_detector_unittest.cc",
   ]
 
+  if (is_android) {
+    sources -= [ "user_activity/user_activity_detector_unittest.cc" ]
+  }
+
   if (is_ios) {
     # Compile this Mac file on iOS as well.
     set_sources_assignment_filter([])
     sources += [ "l10n/l10n_util_mac_unittest.mm" ]
     set_sources_assignment_filter(sources_assignment_filter)
   } else {  # !is_ios
     sources += [
       "accelerators/accelerator_manager_unittest.cc",
       "accelerators/menu_label_accelerator_util_linux_unittest.cc",
       "clipboard/custom_data_helper_unittest.cc",
@@ skipping 149 matching lines @@
 # TODO(GYP) Mac (ui_base_tests_bundle)
 if (is_android) {
   unittest_apk("ui_base_unittests_apk") {
     unittests_dep = ":ui_base_unittests"
     deps = [
       ":ui_base_unittests",
       "//chrome:resources",
     ]
   }
 }