Add additional error logging to investigate Autocomplete Sync failures.

chrome/browser/sync/profile_sync_service_autofill_unittest.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 <set>
 #include <string>
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 442 matching lines @@
     sync_api::ReadNode autofill_root(&trans);
     if (autofill_root.InitByTagLookup(
             syncable::ModelTypeToRootTag(syncable::AUTOFILL)) !=
                 BaseNode::INIT_OK) {
       return false;
     }
 
     sync_api::WriteNode node(&trans);
     std::string tag = AutocompleteSyncableService::KeyToTag(
         UTF16ToUTF8(entry.key().name()), UTF16ToUTF8(entry.key().value()));
-    if (!node.InitUniqueByCreation(syncable::AUTOFILL, autofill_root, tag))
+    sync_api::WriteNode::InitUniqueByCreationResult result =
+        node.InitUniqueByCreation(syncable::AUTOFILL, autofill_root, tag);
+    if (result != sync_api::WriteNode::INIT_SUCCESS)
       return false;
 
     sync_pb::EntitySpecifics specifics;
     AutocompleteSyncableService::WriteAutofillEntry(entry, &specifics);
     sync_pb::AutofillSpecifics* autofill_specifics =
         specifics.mutable_autofill();
     node.SetAutofillSpecifics(*autofill_specifics);
     return true;
   }
 
   bool AddAutofillSyncNode(const AutofillProfile& profile) {
     sync_api::WriteTransaction trans(FROM_HERE, service_->GetUserShare());
     sync_api::ReadNode autofill_root(&trans);
     if (autofill_root.InitByTagLookup(kAutofillProfileTag) !=
             BaseNode::INIT_OK) {
       return false;
     }
     sync_api::WriteNode node(&trans);
     std::string tag = profile.guid();
-    if (!node.InitUniqueByCreation(syncable::AUTOFILL_PROFILE,
-                                   autofill_root, tag))
+    sync_api::WriteNode::InitUniqueByCreationResult result =
+        node.InitUniqueByCreation(syncable::AUTOFILL_PROFILE,
+                                  autofill_root, tag);
+    if (result != sync_api::WriteNode::INIT_SUCCESS)
       return false;
+
     sync_pb::EntitySpecifics specifics;
     AutofillProfileSyncableService::WriteAutofillProfile(profile, &specifics);
     sync_pb::AutofillProfileSpecifics* profile_specifics =
         specifics.mutable_autofill_profile();
     node.SetAutofillProfileSpecifics(*profile_specifics);
     return true;
   }
 
   bool GetAutofillEntriesFromSyncDB(std::vector<AutofillEntry>* entries,
                                     std::vector<AutofillProfile>* profiles) {
@@ skipping 757 matching lines @@
   std::vector<AutofillEntry> sync_entries;
   std::vector<AutofillProfile> sync_profiles;
   ASSERT_TRUE(GetAutofillEntriesFromSyncDB(&sync_entries, &sync_profiles));
   EXPECT_EQ(3U, sync_entries.size());
   EXPECT_EQ(0U, sync_profiles.size());
   for (size_t i = 0; i < sync_entries.size(); i++) {
     DVLOG(1) << "Entry " << i << ": " << sync_entries[i].key().name()
              << ", " << sync_entries[i].key().value();
   }
 }