Wire sync shutdown reason from PSS all the way down to sync manager.

chrome/browser/sync/glue/sync_backend_host_core.h

 // Copyright 2013 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 CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_CORE_H_
 #define CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_CORE_H_
 
 #include "base/memory/ref_counted.h"
 
 #include "base/timer/timer.h"
 #include "chrome/browser/sync/glue/sync_backend_host_impl.h"
 #include "components/sync_driver/system_encryptor.h"
 #include "sync/internal_api/public/base/cancelation_signal.h"
 #include "sync/internal_api/public/sessions/type_debug_info_observer.h"
+#include "sync/internal_api/public/shutdown_reason.h"
 #include "sync/internal_api/public/sync_encryption_handler.h"
 #include "url/gurl.h"
 
 namespace browser_sync {
 
 class SyncBackendHostImpl;
 
 // Utility struct for holding initialization options.
 struct DoInitializeOptions {
   DoInitializeOptions(
@@ skipping 162 matching lines @@
   // thread.  This function asynchronously continues the work started in
   // DoInitialProcessControlTypes() once that other thread gets back to us.
   void DoFinishInitialProcessControlTypes();
 
   // The shutdown order is a bit complicated:
   // 1) Call ShutdownOnUIThread() from |frontend_loop_| to request sync manager
   //    to stop as soon as possible.
   // 2) Post DoShutdown() to sync loop to clean up backend state, save
   //    directory and destroy sync manager.
   void ShutdownOnUIThread();
-  void DoShutdown(bool sync_disabled);
-  void DoDestroySyncManager();
+  void DoShutdown(syncer::ShutdownReason reason);
+  void DoDestroySyncManager(syncer::ShutdownReason reason);
 
   // Configuration methods that must execute on sync loop.
   void DoConfigureSyncer(
       syncer::ConfigureReason reason,
       const DoConfigureSyncerTypes& config_types,
       const syncer::ModelSafeRoutingInfo routing_info,
       const base::Callback<void(syncer::ModelTypeSet,
                                 syncer::ModelTypeSet)>& ready_task,
       const base::Closure& retry_callback);
   void DoFinishConfigureDataTypes(
@@ skipping 118 matching lines @@
   std::string signin_scoped_device_id_;
 
   base::WeakPtrFactory<SyncBackendHostCore> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostCore);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_CORE_H_