Add the vibrate attribute to the Notification object

public/platform/modules/notifications/WebNotificationVibrationData.h

Index: public/platform/modules/notifications/WebNotificationVibrationData.h
diff --git a/public/platform/modules/notifications/WebNotificationVibrationData.h b/public/platform/modules/notifications/WebNotificationVibrationData.h
new file mode 100644
index 0000000000000000000000000000000000000000..e6a02693eaf9f082201e24cfa86e6d145289ae18
--- /dev/null
+++ b/public/platform/modules/notifications/WebNotificationVibrationData.h
@@ -0,0 +1,37 @@
+// Copyright 2015 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 WebNotificationVibrationData_h
+#define WebNotificationVibrationData_h
+
+#include "public/platform/WebVector.h"
+
+namespace blink {
+
+// Structure representing the data associated with a Web Notification's vibrate.
+struct WebNotificationVibrationData {
+    enum Type {
+        TypeNone,
+        TypeUnsignedLong,
+        TypeUnsignedLongSequence

[Sanghyun Park, 2015/04/02 18:59:34]

This structure is necessary to return vibrate value as set by the user.
This value will be serialized in order to store in the notification database.

+    };
+
+    WebNotificationVibrationData()
+        : type(TypeNone)
+    {
+    }
+
+    WebNotificationVibrationData(Type type, const WebVector<unsigned>& vibrate)
+        : type(type)
+        , pattern(vibrate)
+    {
+    }
+
+    Type type;
+    WebVector<unsigned> pattern;
+};
+
+} // namespace blink
+
+#endif // WebNotificationVibrationData_h