Re-land: Resurrect Aura Linux 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/ui.gni")
 import("//build/json_schema_api.gni")
 import("//testing/test.gni")
 
 component("accessibility") {
   sources = [
     "ax_node.cc",
     "ax_node.h",
     "ax_node_data.cc",
     "ax_node_data.h",
     "ax_serializable_tree.cc",
@@ skipping 25 matching lines @@
   public_deps = [
     ":ax_gen",
     "//base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (is_win) {
     public_deps += [ "//third_party/iaccessible2" ]
   }
+
+  if (use_aura && !is_chromeos && is_linux && use_x11) {
+    sources += [
+      "platform/atk_util_auralinux.cc",
+      "platform/atk_util_auralinux.h",
+      "platform/ax_platform_node_auralinux.cc",
+      "platform/ax_platform_node_auralinux.h",
+    ]
+
+    configs += [
+      "//build/config/linux:atk",
+      "//build/config/linux:atk_warnings",
+      "//build/config/linux:gconf",
+      "//build/config/linux:glib",
+    ]
+  }
 }
 
 source_set("test_support") {
   sources = [
     "platform/test_ax_node_wrapper.cc",
     "platform/test_ax_node_wrapper.h",
     "tree_generator.cc",
     "tree_generator.h",
   ]
 
@@ skipping 29 matching lines @@
 json_schema_api("ax_gen") {
   sources = [
     "ax_enums.idl",
   ]
   deps = [
     "//base/third_party/dynamic_annotations",
   ]
   root_namespace = "ui"
   schemas = true
 }