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

chrome/browser/sync/internal_api/sync_manager.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_INTERNAL_API_SYNC_MANAGER_H_
 #define CHROME_BROWSER_SYNC_INTERNAL_API_SYNC_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 365 matching lines @@
     virtual void OnClearServerDataSucceeded() = 0;
     virtual void OnClearServerDataFailed() = 0;
 
     // Called after we finish encrypting all appropriate datatypes.
     virtual void OnEncryptionComplete(
         const syncable::ModelTypeSet& encrypted_types) = 0;
 
     virtual void OnActionableError(
         const browser_sync::SyncProtocolError& sync_protocol_error) = 0;
 
+    // Called by the syncer when it encouters an unrecoverable error.
+    virtual void OnUnrecoverableError(
+        const tracked_objects::Location& location,
+        const std::string& message) = 0;
+
    protected:
     virtual ~Observer();
   };
 
   // Create an uninitialized SyncManager.  Callers must Init() before using.
   explicit SyncManager(const std::string& name);
   virtual ~SyncManager();
 
   // Initialize the sync manager.  |database_location| specifies the path of
   // the directory in which to locate a sqlite repository storing the syncer
@@ skipping 172 matching lines @@
 };
 
 bool InitialSyncEndedForTypes(syncable::ModelTypeSet types, UserShare* share);
 
 // Returns the string representation of a PassphraseRequiredReason value.
 std::string PassphraseRequiredReasonToString(PassphraseRequiredReason reason);
 
 } // namespace sync_api
 
 #endif  // CHROME_BROWSER_SYNC_INTERNAL_API_SYNC_MANAGER_H_