Fix bug 175858: [Linux] The panel does not accept keyboard input when it is minimized and expanded

chrome/browser/ui/gtk/panels/panel_titlebar_gtk.cc

 // Copyright (c) 2012 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/ui/gtk/panels/panel_titlebar_gtk.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/gtk/custom_button.h"
 #include "chrome/browser/ui/gtk/gtk_theme_service.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
@@ skipping 248 matching lines @@
   DCHECK(event && event->type == GDK_BUTTON_RELEASE);
 
   if (minimize_button_->widget() == button) {
     panel->OnMinimizeButtonClicked(
         (event->button.state & GDK_CONTROL_MASK) ?
             panel::APPLY_TO_ALL : panel::NO_MODIFIER);
   } else if (restore_button_->widget() == button) {
     panel->OnRestoreButtonClicked(
         (event->button.state & GDK_CONTROL_MASK) ?
             panel::APPLY_TO_ALL : panel::NO_MODIFIER);
+    panel->Activate();
   }
 
   gdk_event_free(event);
 }
 
 void PanelTitlebarGtk::SendEnterNotifyToCloseButtonIfUnderMouse() {
   if (!close_button())
     return;
 
   gint x;
@@ skipping 29 matching lines @@
   event->crossing.state = 0;
 
   g_signal_emit_by_name(GTK_OBJECT(close_button()->widget()),
                         "enter-notify-event", event,
                         &return_value);
 }
 
 GtkWidget* PanelTitlebarGtk::widget() const {
   return container_;
 }