Resurrect Aura Linux accessibility.

ui/accessibility/BUILD.gn

Index: ui/accessibility/BUILD.gn
diff --git a/ui/accessibility/BUILD.gn b/ui/accessibility/BUILD.gn
index d168b5e25a94f06b501695f452d13eae5ec9116b..7ac325ec0bd0ce4a2878129569e88bd2173f0a3d 100644
--- a/ui/accessibility/BUILD.gn
+++ b/ui/accessibility/BUILD.gn
@@ -2,6 +2,7 @@
 # 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")
 
@@ -47,6 +48,22 @@ component("accessibility") {
   if (is_win) {
     public_deps += [ "//third_party/iaccessible2" ]
   }
+
+  if (use_aura && !is_chromeos && is_linux) {
+    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") {