Implement Invalidator::Acknowledge

chrome/browser/sync/profile_sync_service.cc

Index: chrome/browser/sync/profile_sync_service.cc
diff --git a/chrome/browser/sync/profile_sync_service.cc b/chrome/browser/sync/profile_sync_service.cc
index 366026f19d0ee7d468d93903afe21b9b920ee832..9f978ca79efe0976ed501cdf8805f2949d8e525e 100644
--- a/chrome/browser/sync/profile_sync_service.cc
+++ b/chrome/browser/sync/profile_sync_service.cc
@@ -468,6 +468,14 @@ void ProfileSyncService::UnregisterInvalidationHandler(
   invalidator_registrar_.UnregisterHandler(handler);
 }
 
+void ProfileSyncService::AcknowledgeInvalidation(
+    const invalidation::ObjectId& id,
+    const syncer::AckHandle& ack_handle) {
+  // TODO(dcheng): This DCHECK is probably wrong.
+  DCHECK(backend_.get());
+  backend_->AcknowledgeInvalidation(id, ack_handle);
+}
+
 syncer::InvalidatorState ProfileSyncService::GetInvalidatorState() const {
   return invalidator_registrar_.GetInvalidatorState();
 }