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 1436a21476259b9dccf41ed866ed44ac68b9cedd..99d0c2b2e3259fbe99ae60f33d54d0df2d1ba81d 100644
--- a/chrome/browser/sync/test_profile_sync_service.cc
+++ b/chrome/browser/sync/test_profile_sync_service.cc
@@ -67,7 +67,7 @@ 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*
@@ -140,7 +140,7 @@ 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()));
   }
 }