sync: centralize sync startup decisions in TryStart.

chrome/browser/sync/profile_sync_service_mock.h

Index: chrome/browser/sync/profile_sync_service_mock.h
diff --git a/chrome/browser/sync/profile_sync_service_mock.h b/chrome/browser/sync/profile_sync_service_mock.h
index aaa503797fad0cb522c351a93124edd5a405468c..c526aec291504f735efd80d9d8223fd906e4c520 100644
--- a/chrome/browser/sync/profile_sync_service_mock.h
+++ b/chrome/browser/sync/profile_sync_service_mock.h
@@ -63,7 +63,7 @@ class ProfileSyncServiceMock : public ProfileSyncService {
                     browser_sync::ChangeProcessor*));
   MOCK_METHOD1(DeactivateDataType, void(syncer::ModelType));
 
-  MOCK_METHOD0(InitializeBackend, void());
+  MOCK_METHOD0(StartUp, void());
   MOCK_METHOD1(AddObserver, void(Observer*));
   MOCK_METHOD1(RemoveObserver, void(Observer*));
   MOCK_METHOD0(GetJsController, base::WeakPtr<syncer::JsController>());
@@ -89,6 +89,7 @@ class ProfileSyncServiceMock : public ProfileSyncService {
   MOCK_CONST_METHOD0(waiting_for_auth, bool());
   MOCK_METHOD1(OnActionableError, void(
       const syncer::SyncProtocolError&));
+  MOCK_METHOD1(SetSetupInProgress, void(bool));
 
   // DataTypeManagerObserver mocks.
   MOCK_METHOD0(OnConfigureBlocked, void());