Fix Silverlight windowless plugin painting issues. This fixes the following...

webkit/glue/webplugin_impl.cc

 // Copyright (c) 2006-2008 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 "config.h"
 
 #include "base/compiler_specific.h"
 #include "build/build_config.h"
 
 MSVC_PUSH_WARNING_LEVEL(0);
@@ skipping 638 matching lines @@
     move.clip_rect = webkit_glue::FromIntRect(clip_rect);
     move.cutout_rects = cutout_rects;
     move.visible = visible_;
 
     webview->delegate()->DidMove(webview, move);
   }
 
   delegate_->UpdateGeometry(
       webkit_glue::FromIntRect(window_rect),
       webkit_glue::FromIntRect(clip_rect), cutout_rects,
-      received_first_paint_notification_? visible_ : false);
+      windowless_ || received_first_paint_notification_ ? visible_ : false);
 
   // delegate_ can go away as a result of above call, so check it first.
   if (force_geometry_update_ && delegate_) {
     force_geometry_update_ = false;
     delegate_->FlushGeometryUpdates();
   }
 
   // Initiate a download on the plugin url. This should be done for the
   // first update geometry sequence.
   if (first_geometry_update_) {
@@ skipping 625 matching lines @@
 
   MultiPartResponseClient* multi_part_response_client =
       new MultiPartResponseClient(client);
 
   MultipartResponseDelegate* multi_part_response_handler =
       new MultipartResponseDelegate(multi_part_response_client, NULL,
                                     response,
                                     multipart_boundary);
   multi_part_response_map_[client] = multi_part_response_handler;
 }