[Sync] Add sync api support for context changes

chrome/browser/sync/glue/shared_change_processor_ref.cc

Index: chrome/browser/sync/glue/shared_change_processor_ref.cc
diff --git a/chrome/browser/sync/glue/shared_change_processor_ref.cc b/chrome/browser/sync/glue/shared_change_processor_ref.cc
index 366bb4ecc1087f9e43e49f513d799f147fbd691c..16d2855658895874ce2da17f452b8788e545f3d8 100644
--- a/chrome/browser/sync/glue/shared_change_processor_ref.cc
+++ b/chrome/browser/sync/glue/shared_change_processor_ref.cc
@@ -25,6 +25,12 @@ syncer::SyncDataList SharedChangeProcessorRef::GetAllSyncData(
   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) {