Start building message_center on Mac.

ui/message_center/message_center_tray.cc

 // Copyright (c) 2013 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 "ui/message_center/message_center_tray.h"
 
 #include "base/observer_list.h"
 #include "base/utf_string_conversions.h"
 #include "grit/ui_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/message_center/message_center_tray_delegate.h"
 
 namespace message_center {
 namespace {
 
 // Menu commands
 const int kToggleQuietMode = 0;
 const int kEnableQuietModeHour = 1;
 const int kEnableQuietModeDay = 2;
 
 }
 
+#if !defined(TOOLKIT_VIEWS)
+MESSAGE_CENTER_EXPORT MessageCenterTrayDelegate* CreateMessageCenterTray() {
+  NOTIMPLEMENTED();
+  return NULL;
+}
+#endif
+
 MessageCenterTray::MessageCenterTray(
     MessageCenterTrayDelegate* delegate,
     message_center::MessageCenter* message_center)
     : message_center_(message_center),
       message_center_visible_(false),
       popups_visible_(false),
       delegate_(delegate) {
   message_center_->AddObserver(this);
 }
 
@@ skipping 119 matching lines @@
       base::TimeDelta::FromDays(1):
       base::TimeDelta::FromHours(1);
   message_center()->notification_list()->EnterQuietModeWithExpire(expires_in);
 }
 
 void MessageCenterTray::NotifyMessageCenterTrayChanged() {
   delegate_->OnMessageCenterTrayChanged();
 }
 
 }  // namespace message_center