Fix paint flashing when switching tabs on ChromeOS. It seems like this hidden tab host window isn...

views/widget/native_widget_gtk.cc

 // 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.
 
 #include "views/widget/native_widget_gtk.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #include <X11/extensions/shape.h>
 #include <X11/Xatom.h>
@@ skipping 879 matching lines @@
     gtk_window_move(gtk_window, bounds.x(), bounds.y());
   }
 }
 
 void NativeWidgetGtk::SetSize(const gfx::Size& size) {
   if (child_) {
     GtkWidget* parent = gtk_widget_get_parent(widget_);
     if (GTK_IS_VIEWS_FIXED(parent)) {
       gtk_views_fixed_set_widget_size(widget_, size.width(), size.height());
     } else {
-      DCHECK(GTK_IS_FIXED(parent))
-          << "Parent of NativeWidgetGtk has to be Fixed or ViewsFixed";
       gtk_widget_set_size_request(widget_, size.width(), size.height());
     }
   } else {
     if (GTK_WIDGET_MAPPED(widget_))
       gdk_window_resize(widget_->window, size.width(), size.height());
     GtkWindow* gtk_window = GTK_WINDOW(widget_);
     if (!size.IsEmpty())
       gtk_window_resize(gtk_window, size.width(), size.height());
   }
 }
@@ skipping 895 matching lines @@
 
   // And now, notify them that they have a brand new parent.
   for (NativeWidgets::iterator it = widgets.begin();
        it != widgets.end(); ++it) {
     (*it)->GetWidget()->NotifyNativeViewHierarchyChanged(true,
                                                          new_parent);
   }
 }
 
 }  // namespace views