sync: Support non-blocking initial sync in proto

sync/engine/get_updates_processor.h

 // Copyright 2014 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 SYNC_ENGINE_GET_UPDATES_PROCESSOR_H
 #define SYNC_ENGINE_GET_UPDATES_PROCESSOR_H
 
 #include <map>
 #include <vector>
 
@@ skipping 75 matching lines @@
       ModelTypeSet gu_types,
       const sync_pb::GetUpdatesResponse& gu_response,
       sessions::StatusController* status_controller);
 
   static void CopyClientDebugInfo(
       sessions::DebugInfoGetter* debug_info_getter,
       sync_pb::DebugInfo* debug_info);
 
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, BookmarkNudge);
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, NotifyMany);
+  FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, InitialSyncRequest);
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, ConfigureTest);
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, PollTest);
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, RetryTest);
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, NudgeWithRetryTest);
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, InvalidResponse);
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, MoreToDownloadResponse);
   FRIEND_TEST_ALL_PREFIXES(GetUpdatesProcessorTest, NormalResponseTest);
   FRIEND_TEST_ALL_PREFIXES(DownloadUpdatesDebugInfoTest,
                            VerifyCopyClientDebugInfo_Empty);
   FRIEND_TEST_ALL_PREFIXES(DownloadUpdatesDebugInfoTest, VerifyCopyOverwrites);
 
   // A map of 'update handlers', one for each enabled type.
   // This must be kept in sync with the routing info.  Our temporary solution to
   // that problem is to initialize this map in set_routing_info().
   UpdateHandlerMap* update_handler_map_;
 
   const GetUpdatesDelegate& delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(GetUpdatesProcessor);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_GET_UPDATES_PROCESSOR_H_