Simulate transient error and verify exponential backoff.

chrome/browser/sync/test_profile_sync_service.cc

Index: chrome/browser/sync/test_profile_sync_service.cc
diff --git a/chrome/browser/sync/test_profile_sync_service.cc b/chrome/browser/sync/test_profile_sync_service.cc
index 8173f01b96739c6816910aeb5872faffc28555a2..22737a1d4df168d7f7df7e337d2753f9bfcb6741 100644
--- a/chrome/browser/sync/test_profile_sync_service.cc
+++ b/chrome/browser/sync/test_profile_sync_service.cc
@@ -75,7 +75,7 @@ void SyncBackendHostForProfileSyncTest::
   core_->HandleSyncCycleCompletedOnFrontendLoop(new SyncSessionSnapshot(
       SyncerStatus(), ErrorCounters(), 0, false,
       sync_ended, download_progress_markers, false, false, 0, 0, 0, false,
-      SyncSourceInfo(), 0));
+      SyncSourceInfo(), 0, base::Time::Now()));
 }
 
 sync_api::HttpPostProviderFactory*
@@ -116,7 +116,7 @@ void SyncBackendHostForProfileSyncTest::StartConfiguration(
     core_->HandleSyncCycleCompletedOnFrontendLoop(new SyncSessionSnapshot(
         SyncerStatus(), ErrorCounters(), 0, false,
         sync_ended, download_progress_markers, false, false, 0, 0, 0, false,
-        SyncSourceInfo(), 0));
+        SyncSourceInfo(), 0, base::Time::Now()));
   }
 }