[Sync] Add sync api support for context changes

chrome/browser/sync/glue/shared_change_processor_ref.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/shared_change_processor_ref.h"
 
 namespace browser_sync {
 
 SharedChangeProcessorRef::SharedChangeProcessorRef(
     const scoped_refptr<SharedChangeProcessor>& change_processor)
     : change_processor_(change_processor) {
   DCHECK(change_processor_.get());
 }
 
 SharedChangeProcessorRef::~SharedChangeProcessorRef() {}
 
 syncer::SyncError SharedChangeProcessorRef::ProcessSyncChanges(
     const tracked_objects::Location& from_here,
     const syncer::SyncChangeList& change_list) {
   return change_processor_->ProcessSyncChanges(from_here, change_list);
 }
 
 syncer::SyncDataList SharedChangeProcessorRef::GetAllSyncData(
     syncer::ModelType type) const {
   return change_processor_->GetAllSyncData(type);
 }
 
+syncer::SyncError SharedChangeProcessorRef::UpdateDataTypeContext(
+    syncer::ModelType type,
+    const std::string& context) {
+  return change_processor_->UpdateDataTypeContext(type, context);
+}
+
 syncer::SyncError SharedChangeProcessorRef::CreateAndUploadError(
     const tracked_objects::Location& from_here,
     const std::string& message) {
   return change_processor_->CreateAndUploadError(from_here, message);
 }
 
 }  // namespace browser_sync