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

sync/internal_api/sync_manager_impl_unittest.cc

 // Copyright 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.
 
 // Unit tests for the SyncApi. Note that a lot of the underlying
 // functionality is provided by the Syncable layer, which has its own
 // unit tests. We'll test SyncApi specific things in this harness.
 
 #include <cstddef>
 #include <map>
@@ skipping 835 matching lines @@
         type_roots_[i->first] = MakeServerNodeForType(
             sync_manager_.GetUserShare(), i->first);
       }
     }
 
     PumpLoop();
   }
 
   void TearDown() {
     sync_manager_.RemoveObserver(&manager_observer_);
-    sync_manager_.ShutdownOnSyncThread();
+    sync_manager_.ShutdownOnSyncThread(STOP_SYNC);
     PumpLoop();
   }
 
   void GetModelSafeRoutingInfo(ModelSafeRoutingInfo* out) {
     (*out)[NIGORI] = GROUP_PASSIVE;
     (*out)[DEVICE_INFO] = GROUP_PASSIVE;
     (*out)[EXPERIMENTS] = GROUP_PASSIVE;
     (*out)[BOOKMARKS] = GROUP_PASSIVE;
     (*out)[THEMES] = GROUP_PASSIVE;
     (*out)[SESSIONS] = GROUP_PASSIVE;
@@ skipping 2322 matching lines @@
 // SyncManagerInitInvalidStorageTest::GetFactory will return
 // DirectoryBackingStore that ensures that SyncManagerImpl::OpenDirectory fails.
 // SyncManagerImpl initialization is done in SyncManagerTest::SetUp. This test's
 // task is to ensure that SyncManagerImpl reported initialization failure in
 // OnInitializationComplete callback.
 TEST_F(SyncManagerInitInvalidStorageTest, FailToOpenDatabase) {
   EXPECT_FALSE(initialization_succeeded_);
 }
 
 }  // namespace syncer