Expose bits of the Web Notification database in the //content API.

content/browser/notifications/notification_database_data_conversions.h

Index: content/browser/notifications/notification_database_data_conversions.h
diff --git a/content/browser/notifications/notification_database_data_conversions.h b/content/browser/notifications/notification_database_data_conversions.h
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+// 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 CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_DATA_CONVERSIONS_H_
+#define CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_DATA_CONVERSIONS_H_
+
+#include <string>
+
+#include "content/common/content_export.h"
+
+namespace content {
+
+struct NotificationDatabaseData;
+
+// Parses the serialized notification data |input| into a new object, |output|.
+// Returns whether the serialized |input| could be deserialized successfully.
+CONTENT_EXPORT bool DeserializeNotificationDatabaseData(
+    const std::string& input,
+    NotificationDatabaseData* output);
+
+// Serializes the contents of |input| into the string |output|. Returns whether
+// the notification data could be serialized successfully.
+CONTENT_EXPORT bool SerializeNotificationDatabaseData(
+    const NotificationDatabaseData& input,
+    std::string* output);
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_DATA_CONVERSIONS_H_