Simulate transient error and verify exponential backoff.

chrome/test/live_sync/sync_errors_test.cc

 // 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.
 
 #include "chrome/browser/sync/profile_sync_service_harness.h"
 #include "chrome/test/live_sync/bookmarks_helper.h"
 #include "chrome/test/live_sync/live_sync_test.h"
 
 using bookmarks_helper::AddFolder;
 using bookmarks_helper::SetTitle;
@@ skipping 13 matching lines @@
   const BookmarkNode* node1 = AddFolder(0, 0, L"title1");
   SetTitle(0, node1, L"new_title1");
   ASSERT_TRUE(GetClient(0)->AwaitSyncCycleCompletion("Offline state change."));
   TriggerBirthdayError();
 
   // Now make one more change so we will do another sync.
   const BookmarkNode* node2 = AddFolder(0, 0, L"title2");
   SetTitle(0, node2, L"new_title2");
   ASSERT_TRUE(GetClient(0)->AwaitSyncDisabled("Birthday error."));
 }
+
+IN_PROC_BROWSER_TEST_F(SyncErrorTest, TransientErrorTest) {
+  ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
+
+  const BookmarkNode* node1 = AddFolder(0, 0, L"title1");
+  SetTitle(0, node1, L"new_title1");
+  ASSERT_TRUE(GetClient(0)->AwaitSyncCycleCompletion("Offline state change."));
+  TriggerTransientError();
+
+  // Now make one more change so we will do another sync.
+  const BookmarkNode* node2 = AddFolder(0, 0, L"title2");
+  SetTitle(0, node2, L"new_title2");
+  ASSERT_TRUE(
+      GetClient(0)->AwaitExponentialBackoffVerification());
+}