gtk: Move ScopedRegion into scoped_region.{h,cc}.

ui/base/gtk/scoped_region.h

+// Copyright (c) 2012 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_BASE_GTK_SCOPED_REGION_H_
+#define UI_BASE_GTK_SCOPED_REGION_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "ui/base/ui_export.h"
+
+typedef struct _GdkRegion GdkRegion;
+
+namespace ui {
+
+// Wraps a GdkRegion. This class provides the same methods as ScopedGDIObject in
+// base/win/scoped_gdi_object.h.
+class UI_EXPORT ScopedRegion {
+ public:
+  ScopedRegion();
+  explicit ScopedRegion(GdkRegion* region);
+
+  ~ScopedRegion();
+
+  void Set(GdkRegion* region);
+
+  GdkRegion* Get();
+
+  GdkRegion* release();
+
+ private:
+  void Close();
+
+  GdkRegion* region_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedRegion);
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_GTK_SCOPED_REGION_H_