Initialize Linux Aura accessibility on the file thread.

ui/accessibility/platform/atk_util_auralinux.h

 // Copyright 2015 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.
 
 #ifndef UI_ACCESSIBILITY_AX_UTIL_AURALINUX_H_
 #define UI_ACCESSIBILITY_AX_UTIL_AURALINUX_H_
 
 #include "base/memory/singleton.h"
 #include "ui/accessibility/ax_export.h"
 
@@ skipping 11 matching lines @@
   // Get the single instance of this class.
   static AtkUtilAuraLinux* GetInstance();
 
   AtkUtilAuraLinux();
   virtual ~AtkUtilAuraLinux();
 
   void Initialize(scoped_refptr<base::TaskRunner> init_task_runner);
 
  private:
   friend struct base::DefaultSingletonTraits<AtkUtilAuraLinux>;
+
+  void CheckIfAccessibilityIsEnabledOnFileThread();
+  bool CheckPlatformAccessibilitySupportOnFileThread();
+  void FinishAccessibilityInitOnUIThread();
+
+#if defined(USE_GCONF)
+  bool is_enabled_;
+#endif
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_AX_UTIL_AURALINUX_H_