Try two for flicker free drawing

views/controls/native/native_view_host_gtk.h

 // Copyright (c) 2011 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 VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_GTK_H_
 #define VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 #include <string>
@@ skipping 39 matching lines @@
 
   // Destroys the GtkFixed that performs clipping on our hosted GtkWidget.
   void DestroyFixed();
 
   NativeWidgetGtk* GetHostWidget() const;
 
   // Returns the descendant of fixed_ that has focus, or NULL if focus is not
   // on a descendant of fixed_.
   GtkWidget* GetFocusedDescendant();
 
+  // Connects a new host widget.
+  void AttachHostWidget();
+
   // Invoked from the 'destroy' signal.
   static void CallDestroy(GtkObject* object, NativeViewHostGtk* host);
 
   // Invoked from the 'focus-in-event' signal.
   static gboolean CallFocusIn(GtkWidget* widget,
                               GdkEventFocus* event,
                               NativeViewHostGtk* button);
 
   // Our associated NativeViewHost.
   NativeViewHost* host_;
@@ skipping 15 matching lines @@
   // The GtkFixed that contains the attached gfx::NativeView (used for
   // clipping).
   GtkWidget* fixed_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewHostGtk);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_GTK_H_