Grab input after toplevel screen locker window is shown.

chrome/browser/chromeos/login/screen_locker.cc

 // Copyright (c) 2010 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/chromeos/login/screen_locker.h"
 
 #include <string>
 #include <vector>
 
 #include "app/l10n_util.h"
@@ skipping 565 matching lines @@
   }
 
   lock_widget_ = new GrabWidget(this);
   lock_widget_->MakeTransparent();
   lock_widget_->InitWithWidget(lock_window_, gfx::Rect());
   if (screen_lock_view_) {
     lock_widget_->SetContentsView(
         new GrabWidgetRootView(screen_lock_view_));
   }
 
-  lock_widget_->Show();
-
   // Configuring the background url.
   std::string url_string =
       CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kScreenSaverUrl);
   background_view_ = new ScreenLockerBackgroundView(lock_widget_,
                                                     screen_lock_view_);
   background_view_->Init(GURL(url_string));
   if (background_view_->ScreenSaverEnabled())
     StartScreenSaver();
 
   DCHECK(GTK_WIDGET_REALIZED(lock_window_->GetNativeView()));
   WmIpc::instance()->SetWindowType(
       lock_window_->GetNativeView(),
       WM_IPC_WINDOW_CHROME_SCREEN_LOCKER,
       NULL);
 
   lock_window_->SetContentsView(background_view_);
   lock_window_->Show();
 
+  // Show lock_widget after the lock_window is shown so that
+  // we can grab inputs immediately.
+  lock_widget_->Show();
+
   // Don't let X draw default background, which was causing flash on
   // resume.
   gdk_window_set_back_pixmap(lock_window_->GetNativeView()->window,
                              NULL, false);
   gdk_window_set_back_pixmap(lock_widget_->GetNativeView()->window,
                              NULL, false);
   lock_window->set_toplevel_focus_widget(lock_widget_->window_contents());
 
   // Create the SystemKeyEventListener so it can listen for system keyboard
   // messages regardless of focus while screen locked.
@@ skipping 288 matching lines @@
 
 bool ScreenLocker::AcceleratorPressed(const views::Accelerator& accelerator) {
   if (!background_view_->IsScreenSaverVisible()) {
     StartScreenSaver();
     return true;
   }
   return false;
 }
 
 }  // namespace chromeos