linux-aura: Fix some dragging behaviour.

ui/views/widget/desktop_aura/x11_scoped_capture.h

+// Copyright 2013 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_VIEWS_WIDGET_DESKTOP_AURA_X11_SCOPED_CAPTURE_H_
+#define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_SCOPED_CAPTURE_H_
+
+#include "base/basictypes.h"
+
+typedef unsigned long XID;
+
+namespace views {
+
+// Grabs X11 input on a window., i.e. all subsequent mouse events are dispatched
+// to the window, while the capture is active.
+class X11ScopedCapture {
+ public:
+  explicit X11ScopedCapture(XID window);
+  virtual ~X11ScopedCapture();
+
+ private:
+  bool captured_;
+
+  DISALLOW_COPY_AND_ASSIGN(X11ScopedCapture);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_SCOPED_CAPTURE_H_