[USS] Move GetAllNodes from backend to controller

components/browser_sync/browser/profile_sync_service.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 785 matching lines @@
 
   // Restarts sync clearing directory in the process.
   void OnClearServerDataDone();
 
   // True if setup has been completed at least once and is not in progress.
   bool CanConfigureDataTypes() const;
 
   // 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,
+      scoped_refptr<base::SequencedTaskRunner> task_runner,

[maxbogue, 2016/08/25 23:38:59]

You don't need to pass a task runner here.

[Gang Wu, 2016/08/26 16:48:04]

Done.

+      base::Callback<void(const std::vector<syncer::ModelType>& type,
+                          ScopedVector<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_;
 
   // The class that handles getting, setting, and persisting sync
   // preferences.
   sync_driver::SyncPrefs sync_prefs_;
 
   // TODO(ncarter): Put this in a profile, once there is UI for it.
   // This specifies where to find the sync server.
@@ skipping 204 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_