Initial implementation of new-style notification

ui/message_center/views/message_view_factory.cc

 // Copyright 2016 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/views/message_view_factory.h"
 
+#include "base/command_line.h"
+#include "ui/message_center/message_center_switches.h"
 #include "ui/message_center/notification_types.h"
 #include "ui/message_center/views/notification_view.h"
+#include "ui/message_center/views/notification_view_md.h"
 
 #if defined(OS_WIN)
 #include "ui/base/win/shell.h"
 #endif
 
 namespace message_center {
 
 // static
 MessageView* MessageViewFactory::Create(MessageCenterController* controller,
                                         const Notification& notification,
                                         bool top_level) {
   MessageView* notification_view = nullptr;
   switch (notification.type()) {
     case NOTIFICATION_TYPE_BASE_FORMAT:
     case NOTIFICATION_TYPE_IMAGE:
     case NOTIFICATION_TYPE_MULTIPLE:
     case NOTIFICATION_TYPE_SIMPLE:
-    case NOTIFICATION_TYPE_PROGRESS:
+    case NOTIFICATION_TYPE_PROGRESS: {
+      bool new_style_notification_enabled = false;  // default value
+      if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kEnableMessageCenterNewStyleNotification)) {
+        new_style_notification_enabled = true;
+      } else if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+                     switches::kDisableMessageCenterNewStyleNotification)) {
+        new_style_notification_enabled = false;
+      }
+
       // All above roads lead to the generic NotificationView.
-      notification_view = new NotificationView(controller, notification);
+      if (new_style_notification_enabled)
+        notification_view = new NotificationViewMD(controller, notification);
+      else
+        notification_view = new NotificationView(controller, notification);
       break;
+    }
 #if defined(TOOLKIT_VIEWS) && !defined(OS_MACOSX)
     case NOTIFICATION_TYPE_CUSTOM:
       notification_view =
           notification.delegate()
               ->CreateCustomMessageView(controller, notification)
               .release();
       break;
 #endif
     default:
       // If the caller asks for an unrecognized kind of view (entirely possible
@@ skipping 18 matching lines @@
   if (top_level && !ui::win::IsAeroGlassEnabled()) {
     return notification_view;
   }
 #endif  // OS_WIN
 
   notification_view->SetIsNested();
   return notification_view;
 }
 
 }  // namespace message_center