Add the Blink APIs for the WebNotificationManager.

public/platform/WebNotificationManager.h

Index: public/platform/WebNotificationManager.h
diff --git a/public/platform/WebNotificationManager.h b/public/platform/WebNotificationManager.h
new file mode 100644
index 0000000000000000000000000000000000000000..a2751b4b2ca82d4ddfbbac6f54b21500af7c8e60
--- /dev/null
+++ b/public/platform/WebNotificationManager.h
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+// 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 WebNotificationManager_h
+#define WebNotificationManager_h
+
+#include "WebNotificationPermission.h"
+
+namespace blink {
+
+struct WebNotificationData;
+class WebNotificationDelegate;
+class WebSerializedOrigin;
+
+// Provides the services to show platform notifications to the user.
+class WebNotificationManager {
+public:
+    virtual ~WebNotificationManager() { }
+
+    // Shows a notification on the user's system.
+    virtual void show(const blink::WebSerializedOrigin&, const WebNotificationData&, WebNotificationDelegate*) = 0;
+
+    // Closes a notification previously shown, and removes it if being shown.
+    virtual void close(WebNotificationDelegate*) = 0;
+
+    // Indicates that the delegate object is being destroyed, and must no longer
+    // be used by the embedder to dispatch events.
+    virtual void notifyDelegateDestroyed(WebNotificationDelegate*) = 0;
+
+    // Synchronously checks the permission level for the given origin.
+    virtual WebNotificationPermission checkPermission(const WebSerializedOrigin&) = 0;
+};
+
+} // namespace blink
+
+#endif // WebNotificationManager_h