Introduces message_center_switches.(h|cc)

ui/message_center/message_center_switches.cc

Index: ui/message_center/message_center_switches.cc
diff --git a/ui/message_center/message_center_constants.cc b/ui/message_center/message_center_switches.cc
similarity index 55%
copy from ui/message_center/message_center_constants.cc
copy to ui/message_center/message_center_switches.cc
index f49518043f7a216745a28f4583c795c04f986daa..bce89e9e269a8771be1dc202046e04d977327745 100644
--- a/ui/message_center/message_center_constants.cc
+++ b/ui/message_center/message_center_switches.cc
@@ -2,11 +2,12 @@
 // 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_constants.h"
+#include "ui/message_center/message_center_switches.h"
 
 namespace message_center {
+namespace switches {
 
-const int kNotificationIconWidth = 80;
-const size_t kNotificationMaxItems = 8;
+const char kEnableNewMessageCenterBubble[] = "enable-new-message-center-bubble";
 
+}  // namespace switches
 }  // namespace message_center