Resize the render widget host even if the widget is hidden.

chrome/browser/renderer_host/render_widget_host_view_gtk.h

 // Copyright (c) 2006-2009 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 
 #include <gdk/gdk.h>
 
 #include <map>
@@ skipping 118 matching lines @@
 
   // A convenience wrapper object for GtkIMContext;
   scoped_ptr<GtkIMContextWrapper> im_context_;
 
   // A convenience object for handling editor key bindings defined in gtk
   // keyboard theme.
   scoped_ptr<GtkKeyBindingsHandler> key_bindings_handler_;
 
   // Helper class that lets us allocate plugin containers and move them.
   GtkPluginContainerManager plugin_container_manager_;
+
+  // The size that we want the renderer to be.  We keep this in a separate
+  // variable because resizing in GTK+ is async.
+  gfx::Size requested_size_;
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_