Improve scrolling performance when there are many windowed plugins in a page....

webkit/glue/plugins/test/plugin_npobject_lifetime_test.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 "webkit/glue/plugins/test/plugin_npobject_lifetime_test.h"
 
 namespace NPAPIClient {
 
 const int kNPObjectLifetimeTimer = 100;
 const int kNPObjectLifetimeTimerElapse = 2000;
@@ skipping 95 matching lines @@
 }
 
 NPObjectDeletePluginInNPN_Evaluate::~NPObjectDeletePluginInNPN_Evaluate() {
   if (plugin_instance_object_) {
     HostFunctions()->releaseobject(plugin_instance_object_);
     plugin_instance_object_ = NULL;
   }
 }
 
 NPError NPObjectDeletePluginInNPN_Evaluate::SetWindow(NPWindow* np_window) {
-  if (!::IsWindowVisible(reinterpret_cast<HWND>(np_window->window)))
-    return NPERR_NO_ERROR;
-
   HWND window_handle = reinterpret_cast<HWND>(np_window->window);
   // We setup a timerproc to invoke NPN_Evaluate to destroy this plugin
   // instance. This is to ensure that we don't destroy the plugin instance
   // while it is being used in webkit as this leads to crashes and is a
   // more accurate representation of the renderer crash as described in
   // http://b/issue?id=1134683.
   if (!npn_evaluate_timer_proc_set_) {
     npn_evaluate_timer_proc_set_ = true;
     SetTimer(window_handle, kNPObjectLifetimeTimer, kNPObjectLifetimeTimerElapse,
              TimerProc);
@@ skipping 27 matching lines @@
 
   NPVariant result_var;
   NPError result = g_npn_evaluate_test_instance_->HostFunctions()->evaluate(
                       g_npn_evaluate_test_instance_->id(), window_obj,
                       &script_string, &result_var);
   // If this test failed we would have crashed by now.
 }
 
 } // namespace NPAPIClient