Simulate transient error and verify exponential backoff.

chrome/test/live_sync/live_sync_test.h

 // Copyright (c) 2011 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_TEST_LIVE_SYNC_LIVE_SYNC_TEST_H_
 #define CHROME_TEST_LIVE_SYNC_LIVE_SYNC_TEST_H_
 #pragma once
 
 #include "chrome/test/base/in_process_browser_test.h"
 
@@ skipping 124 matching lines @@
 
   // Triggers a migration for one or more datatypes, and waits
   // for the server to complete it.  This operation is available
   // only if ServerSupportsErrorTriggering() returned true.
   void TriggerMigrationDoneError(const syncable::ModelTypeSet& model_types);
 
   // Triggers the server to set its birthday to a random value thereby
   // the server would return a birthday error on next sync.
   void TriggerBirthdayError();
 
+  // Triggers a transient error on the server. Note the server will stay in
+  // this state until shut down.
+  void TriggerTransientError();
+
  protected:
   // InProcessBrowserTest override. Destroys all the sync clients and sync
   // profiles created by a test.
   virtual void CleanUpOnMainThread();
 
   // InProcessBrowserTest override. Changes behavior of the default host
   // resolver to avoid DNS lookup errors.
   virtual void SetUpInProcessBrowserTestFixture();
 
   // InProcessBrowserTest override. Resets the host resolver its default
@@ skipping 104 matching lines @@
   // Fake URLFetcher factory used to mock out GAIA signin.
   scoped_ptr<FakeURLFetcherFactory> factory_;
 
   // URLFetcher factory used to contact sync server.
   scoped_ptr<URLFetcherFactory> integration_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LiveSyncTest);
 };
 
 #endif  // CHROME_TEST_LIVE_SYNC_LIVE_SYNC_TEST_H_