[Sync] - Upload the callstacks for errors so that the line number of error is in callstack.

chrome/browser/sync/glue/model_associator.h

 // Copyright (c) 2012 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_GLUE_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_SYNC_GLUE_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/synchronization/lock.h"
+#include "chrome/browser/sync/api/sync_error.h"
 #include "sync/syncable/model_type.h"
 
-class SyncError;
-
 namespace sync_api {
 class BaseNode;
 }
 
 namespace browser_sync {
 
 // This represents the fundamental operations used for model association that
 // are common to all ModelAssociators and do not depend on types of the models
 // being associated.
 class AssociatorInterface {
  public:
   virtual ~AssociatorInterface() {}
 
   // Iterates through both the sync and the chrome model looking for
   // matched pairs of items. After successful completion, the models
   // should be identical and corresponding. Returns true on
   // success. On failure of this step, we should abort the sync
   // operation and report an error to the user.
-  // TODO(zea): return a SyncError instead of passing one in.
-  virtual bool AssociateModels(SyncError* error) = 0;
+  virtual SyncError AssociateModels() = 0;
 
   // Clears all the associations between the chrome and sync models.
-  // TODO(zea): return a SyncError instead of passing one in.
-  virtual bool DisassociateModels(SyncError* error) = 0;
+  virtual SyncError DisassociateModels() = 0;
 
   // The has_nodes out parameter is set to true if the sync model has
   // nodes other than the permanent tagged nodes.  The method may
   // return false if an error occurred.
   virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes) = 0;
 
   // Calling this method while AssociateModels() is in progress will
   // cause the method to exit early with a "false" return value.  This
   // is useful for aborting model associations for shutdown.  This
   // method is only implemented for model associators that are invoked
@@ skipping 37 matching lines @@
   // Associates the given chrome node with the given sync id.
   virtual void Associate(const Node* node, int64 sync_id) = 0;
 
   // Remove the association that corresponds to the given sync id.
   virtual void Disassociate(int64 sync_id) = 0;
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_MODEL_ASSOCIATOR_H_