sync: Support nudges from non-blocking sync types

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 54ce66d7f57e6ebe171884dfeb030042104da6ea..168c19f9fc7124ea084948456d50a0ff8b600cec 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -396,7 +396,7 @@ void SyncManagerImpl::Init(
   DVLOG(1) << "Setting invalidator client ID: " << invalidator_client_id;
   allstatus_.SetInvalidatorClientId(invalidator_client_id);
 
-  model_type_registry_.reset(new ModelTypeRegistry(workers, directory()));
+  model_type_registry_.reset(new ModelTypeRegistry(workers, directory(), this));
 
   // Bind the SyncContext WeakPtr to this thread.  This helps us crash earlier
   // if the pointer is misused in debug mode.
@@ -900,6 +900,22 @@ void SyncManagerImpl::RequestNudgeForDataTypes(
                                  nudge_location);
 }
 
+void SyncManagerImpl::NudgeForInitialDownload(syncer::ModelType type) {
+  // TODO(rlarocque): Initial downloads should have a separate nudge type.
+  DCHECK(thread_checker_.CalledOnValidThread());
+  RefreshTypes(ModelTypeSet(type));
+}
+
+void SyncManagerImpl::NudgeForCommit(syncer::ModelType type) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  RequestNudgeForDataTypes(FROM_HERE, ModelTypeSet(type));
+}
+
+void SyncManagerImpl::NudgeForRefresh(syncer::ModelType type) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  RefreshTypes(ModelTypeSet(type));
+}
+
 void SyncManagerImpl::OnSyncCycleEvent(const SyncCycleEvent& event) {
   DCHECK(thread_checker_.CalledOnValidThread());
   // Only send an event if this is due to a cycle ending and this cycle