Added a class acting as a fake caret for accessibility.

ui/accessibility/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/linux/pkg_config.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//tools/json_schema_compiler/json_schema_api.gni")
@@ skipping 38 matching lines @@
     "ax_tree_source.h",
     "ax_tree_update.h",
     "platform/ax_android_constants.cc",
     "platform/ax_android_constants.h",
     "platform/ax_platform_unique_id.cc",
     "platform/ax_platform_unique_id.h",
   ]
 
   if (has_native_accessibility) {
     sources += [
+      "platform/ax_fake_caret_win.cc",
+      "platform/ax_fake_caret_win.h",
       "platform/ax_platform_node.cc",
       "platform/ax_platform_node.h",
       "platform/ax_platform_node_base.cc",
       "platform/ax_platform_node_base.h",
       "platform/ax_platform_node_delegate.h",
       "platform/ax_platform_node_mac.h",
       "platform/ax_platform_node_mac.mm",
       "platform/ax_platform_node_win.cc",
       "platform/ax_platform_node_win.h",
     ]
@@ skipping 122 matching lines @@
 
 fuzzer_test("ax_tree_fuzzer") {
   sources = [
     "ax_tree_fuzzer.cc",
   ]
 
   deps = [
     ":accessibility",
   ]
 }