Reporting: Wrap existing classes in context.

net/reporting/reporting_delegate.h

+// Copyright 2017 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 NET_REPORTING_REPORTING_DELEGATE_H_
+#define NET_REPORTING_REPORTING_DELEGATE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "net/base/net_export.h"
+
+namespace base {
+class Value;
+}  // namespace base
+
+namespace net {
+
+// Delegate for things that the Reporting system can't do by itself, like
+// persisting data across embedder restarts.
+class NET_EXPORT ReportingDelegate {
+ public:
+  virtual ~ReportingDelegate();
+
+  // Gets previously persisted data, if any is available. Returns a null pointer
+  // if no data is available. Can be called any number of times.
+  virtual std::unique_ptr<const base::Value> GetPersistedData() = 0;
+
+  // Sets data to be persisted across embedder restarts. Ideally, this data will
+  // be returned by any future calls to GetPersistedData() in this or future
+  // sessions (until newer data is persisted), but no guarantee is made, since
+  // the underlying persistence mechanism may or may not be reliable.
+  virtual void PersistData(
+      std::unique_ptr<const base::Value> persisted_data) = 0;
+
+ protected:
+  ReportingDelegate();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ReportingDelegate);
+};
+
+}  // namespace net
+
+#endif  // NET_REPORTING_REPORTING_DELEGATE_H_