[Mac]Port browser_keyevents_browsertest.cc and browser_focus_uitest.cc to Mac.

chrome/test/ui_test_utils_linux.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/test/ui_test_utils.h"
 
 #include <gtk/gtk.h>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 67 matching lines @@
 
   DCHECK(view);
   ui_controls::MoveMouseToCenterAndPress(
       view,
       ui_controls::LEFT,
       ui_controls::DOWN | ui_controls::UP,
       new MessageLoop::QuitTask());
   RunMessageLoop();
 }
 
+void HideNativeWindow(gfx::NativeWindow window) {
+  gtk_widget_hide(GTK_WIDGET(window));
+}
+
+void ShowAndFocusNativeWindow(gfx::NativeWindow window) {
+  gtk_window_present(GTK_WINDOW(window));
+}
+
 }  // namespace ui_test_utils