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..634fef9a911f49755dd819d2c1949449712222d7 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 +48,26 @@ 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:gconf",
+      "//build/config/linux:glib",
+    ]
+
+    if (is_clang) {
+      # glib uses the pre-c++11 typedef-as-static_assert hack.
+      cflags = [ "-Wno-unused-local-typedefs" ]
+    }
+  }
 }
 
 source_set("test_support") {