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

sync/internal_api/sync_backup_manager_unittest.cc

 // 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.
 
 #include "sync/internal_api/sync_backup_manager.h"
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/run_loop.h"
 #include "sync/internal_api/public/read_node.h"
 #include "sync/internal_api/public/read_transaction.h"
@@ skipping 79 matching lines @@
                               base::Bind(&OnConfigDone, true),
                               base::Bind(&OnConfigDone, false));
   }
 
   void HandleInit(bool success) {
     if (success) {
       loop_.PostTask(FROM_HERE,
                      base::Bind(&SyncBackupManagerTest::ConfigureSyncer,
                                 base::Unretained(this)));
     } else {
-      manager_->ShutdownOnSyncThread();
+      manager_->ShutdownOnSyncThread(STOP_SYNC);
     }
   }
 
   base::ScopedTempDir temp_dir_;
   base::MessageLoop loop_;    // Needed for WeakHandle
   SyncManager* manager_;
 };
 
 TEST_F(SyncBackupManagerTest, NormalizeAndPersist) {
   scoped_ptr<SyncBackupManager> manager(new SyncBackupManager);
@@ skipping 15 matching lines @@
 
   {
     // New entry has server ID and unsynced bit is cleared after saving.
     ReadTransaction trans(FROM_HERE, manager->GetUserShare());
     ReadNode pref(&trans);
     EXPECT_EQ(BaseNode::INIT_OK,
               pref.InitByClientTagLookup(SEARCH_ENGINES, "test"));
     EXPECT_TRUE(pref.GetEntry()->GetId().ServerKnows());
     EXPECT_FALSE(pref.GetEntry()->GetIsUnsynced());
   }
-  manager->ShutdownOnSyncThread();
+  manager->ShutdownOnSyncThread(STOP_SYNC);
 
   // Reopen db to verify entry is persisted.
   manager.reset(new SyncBackupManager);
   InitManager(manager.get(), STORAGE_ON_DISK);
   {
     ReadTransaction trans(FROM_HERE, manager->GetUserShare());
     ReadNode pref(&trans);
     EXPECT_EQ(BaseNode::INIT_OK,
               pref.InitByClientTagLookup(SEARCH_ENGINES, "test"));
     EXPECT_TRUE(pref.GetEntry()->GetId().ServerKnows());
     EXPECT_FALSE(pref.GetEntry()->GetIsUnsynced());
   }
 }
 
 TEST_F(SyncBackupManagerTest, FailToInitialize) {
   // Test graceful shutdown on initialization failure.
   scoped_ptr<SyncBackupManager> manager(new SyncBackupManager);
   InitManager(manager.get(), STORAGE_INVALID);
 }
 
 }  // anonymous namespace
 
 }  // namespace syncer