MacViews: Handle three-finger swipe gestures for navigation.

ui/views/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/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 import("//ui/ozone/ozone.gni")
 import("//ui/vector_icons/vector_icons.gni")
@@ skipping 881 matching lines @@
     "focus/focus_traversal_unittest.cc",
     "layout/box_layout_unittest.cc",
     "layout/fill_layout_unittest.cc",
     "layout/grid_layout_unittest.cc",
     "rect_based_targeting_utils_unittest.cc",
     "test/widget_test_unittest.cc",
     "view_model_unittest.cc",
     "view_model_utils_unittest.cc",
     "view_targeter_unittest.cc",
     "view_unittest.cc",
+    "view_unittest_mac.mm",
     "widget/native_widget_mac_accessibility_unittest.mm",
     "widget/native_widget_mac_unittest.mm",
     "widget/native_widget_unittest.cc",
     "widget/root_view_unittest.cc",
     "widget/widget_unittest.cc",
     "widget/window_reorderer_unittest.cc",
     "window/custom_frame_view_unittest.cc",
     "window/dialog_client_view_unittest.cc",
     "window/dialog_delegate_unittest.cc",
   ]
@@ skipping 145 matching lines @@
       "//ui/base:test_support",
       "//ui/compositor",
       "//ui/events:test_support",
       "//ui/gl:test_support",
       "//ui/resources",
       "//ui/resources:ui_test_pak",
       "//ui/strings",
     ]
   }
 }