Add additional error logging to investigate Autocomplete Sync failures.

chrome/browser/sync/glue/password_model_associator.cc

 // 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.
 
 #include "chrome/browser/sync/glue/password_model_associator.h"
 
 #include <set>
 
 #include "base/location.h"
 #include "base/stl_util.h"
@@ skipping 99 matching lines @@
                 "Failed to edit password sync node.",
                 model_type());
           }
           WriteToSyncNode(new_password, &write_node);
           updated_passwords.push_back(new_password);
         }
 
         Associate(&tag, node.GetId());
       } else {
         sync_api::WriteNode node(&trans);
-        if (!node.InitUniqueByCreation(syncable::PASSWORDS,
-                                       password_root, tag)) {
+        sync_api::WriteNode::InitUniqueByCreationResult result =
+            node.InitUniqueByCreation(syncable::PASSWORDS, password_root, tag);
+        if (result != sync_api::WriteNode::INIT_SUCCESS) {
           STLDeleteElements(&passwords);
           return error_handler_->CreateAndUploadError(
               FROM_HERE,
               "Failed to create password sync node.",
               model_type());
         }
 
         WriteToSyncNode(**ix, &node);
 
         Associate(&tag, node.GetId());
@@ skipping 303 matching lines @@
     const std::string& password_element,
     const std::string& signon_realm) {
   return net::EscapePath(origin_url) + "|" +
          net::EscapePath(username_element) + "|" +
          net::EscapePath(username_value) + "|" +
          net::EscapePath(password_element) + "|" +
          net::EscapePath(signon_realm);
 }
 
 }  // namespace browser_sync