[USS] Move GetAllNodes from backend to controller

components/browser_sync/browser/profile_sync_service.h

Index: components/browser_sync/browser/profile_sync_service.h
diff --git a/components/browser_sync/browser/profile_sync_service.h b/components/browser_sync/browser/profile_sync_service.h
index f6c426846c7385446f3a789785bec1c64988ead9..323bde2b65af1ac7b8afad12675d4dc075f8f1d6 100644
--- a/components/browser_sync/browser/profile_sync_service.h
+++ b/components/browser_sync/browser/profile_sync_service.h
@@ -803,6 +803,13 @@ class ProfileSyncService : public sync_driver::SyncService,
   // Called when a SetupInProgressHandle issued by this instance is destroyed.
   virtual void OnSetupInProgressHandleDestroyed();
 
+  // Returns a ListValue representing all nodes for the specified types through
+  // |callback| on this thread.
+  void GetAllNodesForTypes(
+      syncer::ModelTypeSet types,
+      base::Callback<void(const syncer::ModelType type,
+                          std::unique_ptr<base::ListValue>)> callback);
+
   // This profile's SyncClient, which abstracts away non-Sync dependencies and
   // the Sync API component factory.
   std::unique_ptr<sync_driver::SyncClient> sync_client_;