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

chrome/browser/sync/engine/sync_scheduler.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.
 //
 // A class to schedule syncer tasks intelligently.
 #ifndef CHROME_BROWSER_SYNC_ENGINE_SYNC_SCHEDULER_H_
 #define CHROME_BROWSER_SYNC_ENGINE_SYNC_SCHEDULER_H_
 #pragma once
 
 #include <string>
@@ skipping 104 matching lines @@
   virtual bool IsSyncingCurrentlySilenced() OVERRIDE;
   virtual void OnReceivedShortPollIntervalUpdate(
       const base::TimeDelta& new_interval) OVERRIDE;
   virtual void OnReceivedLongPollIntervalUpdate(
       const base::TimeDelta& new_interval) OVERRIDE;
   virtual void OnReceivedSessionsCommitDelay(
       const base::TimeDelta& new_delay) OVERRIDE;
   virtual void OnShouldStopSyncingPermanently() OVERRIDE;
   virtual void OnSyncProtocolError(
       const sessions::SyncSessionSnapshot& snapshot) OVERRIDE;
+  virtual void OnUnrecoverableError(
+     const tracked_objects::Location& from_here,
+     const std::string& message) OVERRIDE;
 
   // ServerConnectionEventListener implementation.
   // TODO(tim): schedule a nudge when valid connection detected? in 1 minute?
   virtual void OnServerConnectionEvent(
       const ServerConnectionEvent& event) OVERRIDE;
 
  private:
   enum JobProcessDecision {
     // Indicates we should continue with the current job.
     CONTINUE,
@@ skipping 275 matching lines @@
   scoped_ptr<Syncer> syncer_;
 
   scoped_ptr<sessions::SyncSessionContext> session_context_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncScheduler);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNC_SCHEDULER_H_