Simulate transient error and verify exponential backoff.

chrome/browser/sync/sessions/status_controller.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/sessions/status_controller.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "chrome/browser/sync/syncable/model_type.h"
@@ skipping 88 matching lines @@
   if (shared_.syncer_status.value().invalid_store != invalid_store)
     shared_.syncer_status.mutate()->invalid_store = invalid_store;
 }
 
 void StatusController::set_syncer_stuck(bool syncer_stuck) {
   if (shared_.syncer_status.value().syncer_stuck != syncer_stuck)
     shared_.syncer_status.mutate()->syncer_stuck = syncer_stuck;
 }
 
 void StatusController::set_syncing(bool syncing) {
-  if (shared_.syncer_status.value().syncing != syncing)
+  if (shared_.syncer_status.value().syncing != syncing) {
     shared_.syncer_status.mutate()->syncing = syncing;
+    sync_start_time_ = base::Time::Now();
+  }
 }
 
 void StatusController::set_num_successful_bookmark_commits(int value) {
   if (shared_.syncer_status.value().num_successful_bookmark_commits != value)
     shared_.syncer_status.mutate()->num_successful_bookmark_commits = value;
 }
 
 void StatusController::set_unsynced_handles(
     const std::vector<int64>& unsynced_handles) {
   if (!operator==(unsynced_handles, shared_.unsynced_handles.value())) {
@@ skipping 107 matching lines @@
     NOTREACHED();  // Server should always send changes remaining.
     return false;  // Avoid looping forever.
   }
   // Changes remaining is an estimate, but if it's estimated to be
   // zero, that's firm and we don't have to ask again.
   return updates_response().get_updates().changes_remaining() == 0;
 }
 
 }  // namespace sessions
 }  // namespace browser_sync