Introduce the plumbing necessary to report Unrecoverable error from model safe workers.

chrome/browser/sync/sessions/unrecoverable_error_info.h

+// Copyright (c) 2011 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 CHROME_BROWSER_SYNC_SESSIONS_UNRECOVERABLE_ERROR_INFO_H_
+#define CHROME_BROWSER_SYNC_SESSIONS_UNRECOVERABLE_ERROR_INFO_H_
+#pragma once
+
+#include <string>
+
+#include "base/location.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace browser_sync {
+namespace sessions {
+class UnrecoverableErrorInfo {
+ public:
+  UnrecoverableErrorInfo();
+  ~UnrecoverableErrorInfo();
+
+  void Set(const tracked_objects::Location& location,

[akalin, 2011/10/24 23:20:49]

add constructor that takes in the arguments instead

[lipalani1, 2011/10/25 02:29:46]

Done.

+           const std::string& message);
+
+  bool IsSet() const;
+
+  const tracked_objects::Location& location() const;
+  const std::string& message() const;
+
+ private:
+  scoped_ptr<tracked_objects::Location> location_;

[akalin, 2011/10/24 23:20:49]

no need for scoped_ptr now (Location objs are now assignable)

[lipalani1, 2011/10/25 02:29:46]

Done.

+  std::string message_;
+
+  DISALLOW_COPY_AND_ASSIGN(UnrecoverableErrorInfo);

[akalin, 2011/10/24 23:20:49]

since there's no more scoped_ptr, this can be assignable

[lipalani1, 2011/10/25 02:29:46]

Done.

+};
+
+}  // namespace sessions
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_SESSIONS_UNRECOVERABLE_ERROR_INFO_H_