[Ozone-Dri] Decouple the IO helper thread from DriWrapper

ui/ozone/platform/dri/io_helper_thread.h

Index: ui/ozone/platform/dri/io_helper_thread.h
diff --git a/ui/ozone/platform/dri/io_helper_thread.h b/ui/ozone/platform/dri/io_helper_thread.h
new file mode 100644
index 0000000000000000000000000000000000000000..b61f925115d1b391306011690f8027ee559aceac
--- /dev/null
+++ b/ui/ozone/platform/dri/io_helper_thread.h
@@ -0,0 +1,27 @@
+// 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_OZONE_PLATFORM_DRI_IO_HELPER_THREAD_H_
+#define UI_OZONE_PLATFORM_DRI_IO_HELPER_THREAD_H_
+
+#include "base/threading/thread.h"
+
+namespace ui {
+
+class IOHelperThread : public base::Thread {
+ public:
+  IOHelperThread();
+  ~IOHelperThread() override;
+
+  // Call to start the thread. This needs to be called after the GPU entered the
+  // sandbox.
+  void Initialize();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(IOHelperThread);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRI_IO_HELPER_THREAD_H_