Add a window property to associate RWHVA with its child AX tree ID

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 77 matching lines @@
       "platform/ax_platform_node_auralinux.cc",
       "platform/ax_platform_node_auralinux.h",
     ]
 
     configs += [ "//build/config/linux/atk" ]
 
     if (use_glib) {
       configs += [ "//build/config/linux:glib" ]
     }
   }
+
+  if (use_aura) {
+    sources += [
+      "platform/aura_window_properties.cc",
+      "platform/aura_window_properties.h",
+    ]
+  }
 }
 
 if (is_android) {
   android_library("ui_accessibility_java") {
     deps = [
       "//third_party/android_tools:android_support_annotations_java",
     ]
     srcjar_deps = [ ":ax_enumerations_srcjar" ]
   }
 
@@ skipping 59 matching lines @@
 
 fuzzer_test("ax_tree_fuzzer") {
   sources = [
     "ax_tree_fuzzer.cc",
   ]
 
   deps = [
     ":accessibility",
   ]
 }