[Sync] Add support for sync Persistence Errors

chrome/browser/extensions/api/storage/settings_sync_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 "base/bind.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 79 matching lines @@
  public:
   MockSyncChangeProcessor() : fail_all_requests_(false) {}
 
   // syncer::SyncChangeProcessor implementation.
   virtual syncer::SyncError ProcessSyncChanges(
       const tracked_objects::Location& from_here,
       const syncer::SyncChangeList& change_list) OVERRIDE {
     if (fail_all_requests_) {
       return syncer::SyncError(
           FROM_HERE,
+          syncer::SyncError::DATATYPE_ERROR,
           "MockSyncChangeProcessor: configured to fail",
           change_list[0].sync_data().GetDataType());
     }
     for (syncer::SyncChangeList::const_iterator it = change_list.begin();
         it != change_list.end(); ++it) {
       changes_.push_back(SettingSyncData(*it));
     }
     return syncer::SyncError();
   }
 
@@ skipping 1311 matching lines @@
     ASSERT_EQ(1u, sync_processor_->changes().size());
     SettingSyncData sync_data = sync_processor_->changes()[0];
     EXPECT_EQ(syncer::SyncChange::ACTION_ADD, sync_data.change_type());
     EXPECT_EQ("ext", sync_data.extension_id());
     EXPECT_EQ("key.with.spot", sync_data.key());
     EXPECT_TRUE(sync_data.value().Equals(string_value.get()));
   }
 }
 
 }  // namespace extensions