[Sync] Enable adding notifier observers from ProfileSyncService

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 7e173d15fa2f7de34acda28501b7d6db394abba1..81579f676278e9f0295f78d57c9e4932d7b19ece 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -734,8 +734,15 @@ void SyncManagerImpl::UpdateCredentials(
 void SyncManagerImpl::UpdateEnabledTypes(
     const ModelTypeSet& enabled_types) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  sync_notifier_->UpdateRegisteredIds(this,
-                                      ModelTypeSetToObjectIdSet(enabled_types));
+  sync_notifier_->UpdateRegisteredIds(
+      this,
+      ModelTypeSetToObjectIdSet(enabled_types));
+}
+
+void SyncManagerImpl::UpdateRegisteredIds(

[tim (not reviewing), 2012/08/01 21:52:52]

It'd be nice, maybe just while it's still explicitly plumbed through sync this
way, to call this RegisteredInvalidationIds or something, so it's clear what
"Ids" we're talking about.

[akalin, 2012/08/02 08:05:43]

Done.  Renamed to UpdateRegisteredInvalidationIds.

+    SyncNotifierObserver* handler, const ObjectIdSet& ids) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  sync_notifier_->UpdateRegisteredIds(handler, ids);
 }
 
 void SyncManagerImpl::SetEncryptionPassphrase(