Add additional error logging to investigate Autocomplete Sync failures.

chrome/browser/sync/glue/password_change_processor.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_change_processor.h"
 
 #include <string>
 
 #include "base/location.h"
 #include "base/string_util.h"
@@ skipping 64 matching lines @@
   }
 
   PasswordStoreChangeList* changes =
       content::Details<PasswordStoreChangeList>(details).ptr();
   for (PasswordStoreChangeList::iterator change = changes->begin();
        change != changes->end(); ++change) {
     std::string tag = PasswordModelAssociator::MakeTag(change->form());
     switch (change->type()) {
       case PasswordStoreChange::ADD: {
         sync_api::WriteNode sync_node(&trans);
-        if (sync_node.InitUniqueByCreation(syncable::PASSWORDS,
-                                           password_root, tag)) {
+        sync_api::WriteNode::InitUniqueByCreationResult result =
+            sync_node.InitUniqueByCreation(syncable::PASSWORDS, password_root,
+                                           tag);
+        if (result == sync_api::WriteNode::INIT_SUCCESS) {
           PasswordModelAssociator::WriteToSyncNode(change->form(), &sync_node);
           model_associator_->Associate(&tag, sync_node.GetId());
           break;
         } else {
           // Maybe this node already exists and we should update it.
           //
           // If the PasswordStore is told to add an entry but an entry with the
           // same name already exists, it will overwrite it.  It will report
           // this change as an ADD rather than an UPDATE.  Ideally, it would be
           // able to tell us what action was actually taken, rather than what
@@ skipping 164 matching lines @@
 
 void PasswordChangeProcessor::StopObserving() {
   DCHECK(expected_loop_ == MessageLoop::current());
   notification_registrar_.Remove(
       this,
       chrome::NOTIFICATION_LOGINS_CHANGED,
       content::Source<PasswordStore>(password_store_));
 }
 
 }  // namespace browser_sync