Fix missing backing store in Linux.

chrome/browser/tab_contents/web_contents_view_gtk.cc

 // Copyright (c) 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.
 
 #include "chrome/browser/tab_contents/web_contents_view_gtk.h"
 
 #include <gdk/gdk.h>
 #include <gtk/gtk.h>
 
 #include "base/string_util.h"
@@ skipping 83 matching lines @@
                    G_CALLBACK(OnFocus), web_contents());
   g_signal_connect(view->native_view(), "leave-notify-event",
                    G_CALLBACK(OnLeaveNotify), web_contents());
   g_signal_connect(view->native_view(), "motion-notify-event",
                    G_CALLBACK(OnMouseMove), web_contents());
   gtk_widget_add_events(view->native_view(), GDK_LEAVE_NOTIFY_MASK |
                         GDK_POINTER_MOTION_MASK);
   g_signal_connect(view->native_view(), "button-press-event",
                    G_CALLBACK(OnMouseDown), this);
   gfx::RemoveAllChildren(vbox_.get());
-  gtk_box_pack_start(GTK_BOX(vbox_.get()), content_view_, TRUE, TRUE, 0);
   return view;
 }
 
 gfx::NativeView WebContentsViewGtk::GetNativeView() const {
   return vbox_.get();
 }
 
 gfx::NativeView WebContentsViewGtk::GetContentNativeView() const {
   return content_view_;
 }
@@ skipping 62 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void WebContentsViewGtk::RestoreFocus() {
   // TODO(estade): implement this function.
   // For now just assume we are viewing the tab for the first time.
   SetInitialFocus();
   NOTIMPLEMENTED() << " --  need to restore the focus position on this page.";
 }
 
+void WebContentsViewGtk::SetChildSize(RenderWidgetHostView* rwh_view) {
+  // Packing the gtk widget in a container will cause a configure-event to be
+  // sent to the widget.
+  gtk_box_pack_start(GTK_BOX(vbox_.get()), content_view_, TRUE, TRUE, 0);
+}
+
 void WebContentsViewGtk::UpdateDragCursor(bool is_drop_target) {
   NOTIMPLEMENTED();
 }
 
 // This is called when we the renderer asks us to take focus back (i.e., it has
 // iterated past the last focusable element on the page).
 void WebContentsViewGtk::TakeFocus(bool reverse) {
   web_contents()->delegate()->SetFocusToLocationBar();
 }
 
@@ skipping 41 matching lines @@
   // TODO(port): remove me when the above NOTIMPLEMENTED is fixed.
   if (web_contents()->render_view_host())
     web_contents()->render_view_host()->DragSourceSystemDragEnded();
 }
 
 gboolean WebContentsViewGtk::OnMouseDown(GtkWidget* widget,
     GdkEventButton* event, WebContentsViewGtk* view) {
   view->last_mouse_down_time_ = event->time;
   return FALSE;
 }