sync: Gracefully handle very early shutdown

sync/engine/sync_scheduler_unittest.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/test/test_timeouts.h"
@@ skipping 20 matching lines @@
 using testing::WithArg;
 using testing::WithArgs;
 
 namespace syncer {
 using sessions::SyncSession;
 using sessions::SyncSessionContext;
 using sync_pb::GetUpdatesCallerInfo;
 
 class MockSyncer : public Syncer {
  public:
+  MockSyncer();
   MOCK_METHOD3(NormalSyncShare, bool(ModelTypeSet,
                                      const sessions::NudgeTracker&,
                                      sessions::SyncSession*));
   MOCK_METHOD3(ConfigureSyncShare,
                bool(ModelTypeSet,
                     sync_pb::GetUpdatesCallerInfo::GetUpdatesSource,
                     SyncSession*));
   MOCK_METHOD2(PollSyncShare, bool(ModelTypeSet, sessions::SyncSession*));
 };
 
+MockSyncer::MockSyncer()
+  : Syncer(NULL) {}
+
 typedef std::vector<TimeTicks> SyncShareTimes;
 
 void QuitLoopNow() {
   // We use QuitNow() instead of Quit() as the latter may get stalled
   // indefinitely in the presence of repeated timers with low delays
   // and a slow test (e.g., ThrottlingDoesThrottle [which has a poll
   // delay of 5ms] run under TSAN on the trybots).
   base::MessageLoop::current()->QuitNow();
 }
 
@@ skipping 1134 matching lines @@
   // poll once more
   EXPECT_CALL(*syncer(), PollSyncShare(_,_))
       .WillOnce(DoAll(Invoke(sessions::test_util::SimulatePollSuccess),
                       RecordSyncShare(&times)));
   scheduler()->OnCredentialsUpdated();
   connection()->SetServerStatus(HttpResponse::SERVER_CONNECTION_OK);
   StopSyncScheduler();
 }
 
 }  // namespace syncer