Make message center always scroll up upon notification removal

ui/message_center/message_center_switches.h

Index: ui/message_center/message_center_switches.h
diff --git a/ui/message_center/message_center_switches.h b/ui/message_center/message_center_switches.h
new file mode 100644
index 0000000000000000000000000000000000000000..4cbd39c0476dac99ad509efc0e1b914e47f67f50
--- /dev/null
+++ b/ui/message_center/message_center_switches.h
@@ -0,0 +1,18 @@
+// Copyright 2014 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.
+
+#ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_SWITCHES_H_
+#define UI_MESSAGE_CENTER_MESSAGE_CENTER_SWITCHES_H_
+
+#include "base/compiler_specific.h"
+#include "ui/message_center/message_center_export.h"
+
+namespace switches {
+
+MESSAGE_CENTER_EXPORT extern const char
+    kEnableMessageCenterAlwaysScrollUpUponNotificationRemoval[];
+
+}  // namespace switches
+
+#endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_SWITCHES_H_