MacViews: Implemented Drag & Drop

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/buildflag_header.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
@@ skipping 133 matching lines @@
     "cursor/cursor_loader.h",
     "cursor/cursor_win.cc",
     "default_style.h",
     "default_theme_provider_mac.mm",
     "device_form_factor.h",
     "device_form_factor_android.cc",
     "device_form_factor_android.h",
     "device_form_factor_desktop.cc",
     "device_form_factor_ios.mm",
     "dragdrop/drag_drop_types.h",
+    "dragdrop/drag_drop_types_mac.mm",
     "dragdrop/drag_drop_types_win.cc",
     "dragdrop/drag_source_win.cc",
     "dragdrop/drag_source_win.h",
     "dragdrop/drag_utils_aura.cc",
     "dragdrop/drag_utils_mac.mm",
     "dragdrop/drag_utils_win.cc",
     "dragdrop/drop_target_event.cc",
     "dragdrop/drop_target_event.h",
     "dragdrop/drop_target_win.cc",
     "dragdrop/drop_target_win.h",
@@ skipping 786 matching lines @@
 if (is_mac) {
   mac_framework_bundle("ui_unittests_framework") {
     testonly = true
     deps = [
       "//ui/resources:ui_test_pak_bundle_data",
     ]
     info_plist = "test/framework-Info.plist"
     output_name = "ui_unittests Framework"
   }
 }